Some stylesheets won't load randomly after update

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After i updateted c5 from 8.3.2 to 8.4.3 randomly some stylesheets won't load.
In Detail: as far as i understand c5 creats a stylesheet with most of the extensions and custom css in the cache folder. after clearing cache everything is working fine, but after seconds or somtimes not till a week this stylesheet won't load anymore until clearing cache again. this is quite wired and a can't imagine what could cause this.


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.4.3
Version Installed - 8.4.3
Database Version - 20180716000000

# concrete5 Packages
Fundamental (4.0.6), Magic Tabs (7.1.6), Pagelist Gallery (1.1.7), Safe HTML (7.0), Stack Popover (1.2.7), toesslab - Week Calendar (1.1.2), Touch Gallery 3 (3.2.1)

# concrete5 Overrides
blocks/page_list/templates/masonry/view.php, blocks/page_list/templates/masonry/view.js, blocks/page_list/templates/masonry/view.css, blocks/page_list/templates/masonry, blocks/page_list/templates/simple_thumbnail_list/view.php, blocks/page_list/templates/simple_thumbnail_list/view.css, blocks/page_list/templates/simple_thumbnail_list, blocks/page_list/templates, blocks/page_list, blocks/touch_gallery/view.php, blocks/touch_gallery/templates.bak/polaroid/view.php, blocks/touch_gallery/templates.bak/polaroid/css/polaroid-styles.css, blocks/touch_gallery/templates.bak/polaroid/css, blocks/touch_gallery/templates.bak/polaroid, blocks/touch_gallery/templates.bak/tight_grid/view.php, blocks/touch_gallery/templates.bak/tight_grid/css/tight-grid-styles.css, blocks/touch_gallery/templates.bak/tight_grid/css, blocks/touch_gallery/templates.bak/tight_grid, blocks/touch_gallery/templates.bak/corner_shadow/view.php, blocks/touch_gallery/templates.bak/corner_shadow/css/corner-shadow-styles.css, blocks/touch_gallery/templates.bak/corner_shadow/css, blocks/touch_gallery/templates.bak/corner_shadow, blocks/touch_gallery/templates.bak/sleek/view.php, blocks/touch_gallery/templates.bak/sleek/css/sleek-styles.css, blocks/touch_gallery/templates.bak/sleek/css/images/magnifier.png, blocks/touch_gallery/templates.bak/sleek/css/images, blocks/touch_gallery/templates.bak/sleek/css, blocks/touch_gallery/templates.bak/sleek, blocks/touch_gallery/templates.bak/focus/view.php, blocks/touch_gallery/templates.bak/focus/css/focus-styles.css, blocks/touch_gallery/templates.bak/focus/css, blocks/touch_gallery/templates.bak/focus, blocks/touch_gallery/templates.bak/circled_tech/view.php, blocks/touch_gallery/templates.bak/circled_tech/css/circled-tech-styles.css, blocks/touch_gallery/templates.bak/circled_tech/css, blocks/touch_gallery/templates.bak/circled_tech, blocks/touch_gallery/templates.bak/morph/view.php, blocks/touch_gallery/templates.bak/morph/css/morph-styles.css, blocks/touch_gallery/templates.bak/morph/css, blocks/touch_gallery/templates.bak/morph, blocks/touch_gallery/templates.bak/random_tilt/view.php, blocks/touch_gallery/templates.bak/random_tilt/css/random-tilt-styles.css, blocks/touch_gallery/templates.bak/random_tilt/css, blocks/touch_gallery/templates.bak/random_tilt, blocks/touch_gallery/templates.bak/tilt/view.php, blocks/touch_gallery/templates.bak/tilt/css/tilt-styles.css, blocks/touch_gallery/templates.bak/tilt/css, blocks/touch_gallery/templates.bak/tilt, blocks/touch_gallery/templates.bak/artist_grid/js/gridify.min.js, blocks/touch_gallery/templates.bak/artist_grid/js, blocks/touch_gallery/templates.bak/artist_grid/view.php, blocks/touch_gallery/templates.bak/artist_grid/css/artist-grid-styles.css, blocks/touch_gallery/templates.bak/artist_grid/css, blocks/touch_gallery/templates.bak/artist_grid, blocks/touch_gallery/templates.bak/circled/view.php, blocks/touch_gallery/templates.bak/circled/css/circled-styles.css, blocks/touch_gallery/templates.bak/circled/css, blocks/touch_gallery/templates.bak/circled, blocks/touch_gallery/templates.bak/simple_shadow/view.php, blocks/touch_gallery/templates.bak/simple_shadow/css/simple-shadow-styles.css, blocks/touch_gallery/templates.bak/simple_shadow/css, blocks/touch_gallery/templates.bak/simple_shadow, blocks/touch_gallery/templates.bak, blocks/touch_gallery/view.php.bak, blocks/touch_gallery/templates/polaroid/view.php, blocks/touch_gallery/templates/polaroid/css/polaroid-styles.css, blocks/touch_gallery/templates/polaroid/css, blocks/touch_gallery/templates/polaroid, blocks/touch_gallery/templates/tight_grid/view.php, blocks/touch_gallery/templates/tight_grid/css/tight-grid-styles.css, blocks/touch_gallery/templates/tight_grid/css, blocks/touch_gallery/templates/tight_grid, blocks/touch_gallery/templates/corner_shadow/view.php, blocks/touch_gallery/templates/corner_shadow/css/corner-shadow-styles.css, blocks/touch_gallery/templates/corner_shadow/css, blocks/touch_gallery/templates/corner_shadow, blocks/touch_gallery/templates/sleek/view.php, blocks/touch_gallery/templates/sleek/css/sleek-styles.css, blocks/touch_gallery/templates/sleek/css/images/magnifier.png, blocks/touch_gallery/templates/sleek/css/images, blocks/touch_gallery/templates/sleek/css, blocks/touch_gallery/templates/sleek, blocks/touch_gallery/templates/focus/view.php, blocks/touch_gallery/templates/focus/css/focus-styles.css, blocks/touch_gallery/templates/focus/css, blocks/touch_gallery/templates/focus, blocks/touch_gallery/templates/circled_tech/view.php, blocks/touch_gallery/templates/circled_tech/css/circled-tech-styles.css, blocks/touch_gallery/templates/circled_tech/css, blocks/touch_gallery/templates/circled_tech, blocks/touch_gallery/templates/morph/view.php, blocks/touch_gallery/templates/morph/css/morph-styles.css, blocks/touch_gallery/templates/morph/css, blocks/touch_gallery/templates/morph, blocks/touch_gallery/templates/random_tilt/view.php, blocks/touch_gallery/templates/random_tilt/css/random-tilt-styles.css, blocks/touch_gallery/templates/random_tilt/css, blocks/touch_gallery/templates/random_tilt, blocks/touch_gallery/templates/tilt/view.php, blocks/touch_gallery/templates/tilt/css/tilt-styles.css, blocks/touch_gallery/templates/tilt/css, blocks/touch_gallery/templates/tilt, blocks/touch_gallery/templates/artist_grid/js/gridify.min.js, blocks/touch_gallery/templates/artist_grid/js, blocks/touch_gallery/templates/artist_grid/view.php, blocks/touch_gallery/templates/artist_grid/css/artist-grid-styles.css, blocks/touch_gallery/templates/artist_grid/css, blocks/touch_gallery/templates/artist_grid, blocks/touch_gallery/templates/circled/view.php, blocks/touch_gallery/templates/circled/css/circled-styles.css, blocks/touch_gallery/templates/circled/css, blocks/touch_gallery/templates/circled, blocks/touch_gallery/templates/simple_shadow/view.php, blocks/touch_gallery/templates/simple_shadow/css/simple-shadow-styles.css, blocks/touch_gallery/templates/simple_shadow/css, blocks/touch_gallery/templates/simple_shadow, blocks/touch_gallery/templates, blocks/touch_gallery, blocks/core_stack_display/templates/toesslab_accordion.php, blocks/core_stack_display/templates, blocks/core_stack_display, blocks/feature/view.php, blocks/feature/templates/hover_description/view.php, blocks/feature/templates/hover_description/view.js, blocks/feature/templates/hover_description/view.css, blocks/feature/templates/hover_description, blocks/feature/templates, blocks/feature/view.css, blocks/feature, blocks/testimonial/view.php, blocks/testimonial/view.css, blocks/testimonial, blocks/jl_magic_tabs/templates/self_contained_starter/view.php, blocks/jl_magic_tabs/templates/self_contained_starter/view.css, blocks/jl_magic_tabs/templates/self_contained_starter, blocks/jl_magic_tabs/templates, blocks/jl_magic_tabs, blocks/image_slider/view.php, blocks/image_slider/view.css, blocks/image_slider, blocks/fundamental_slick_slider/css/slick.css, blocks/fundamental_slick_slider/css, blocks/fundamental_slick_slider, blocks/next_previous/add.php, blocks/next_previous/db.xml, blocks/next_previous/view.php, blocks/next_previous/edit.php, blocks/next_previous/form_setup_html.php, blocks/next_previous/icon.png, blocks/next_previous/controller.php, blocks/next_previous, blocks/ds_pagelist_gallery/templates/no_buttons/js/jquery.spin.js, blocks/ds_pagelist_gallery/templates/no_buttons/js/blazy.min.js, blocks/ds_pagelist_gallery/templates/no_buttons/js/isotope.pkgd.min.js, blocks/ds_pagelist_gallery/templates/no_buttons/js/imagesloaded.pkgd.min.js, blocks/ds_pagelist_gallery/templates/no_buttons/js, blocks/ds_pagelist_gallery/templates/no_buttons/view.php, blocks/ds_pagelist_gallery/templates/no_buttons/view.css, blocks/ds_pagelist_gallery/templates/no_buttons, blocks/ds_pagelist_gallery/templates, blocks/ds_pagelist_gallery, elements/footer-custom.php, css/touch-gallery.css, css/images/sprites-dark-thinner.png, css/images/sprites.png, css/images/sprites-light-thin.png, css/images/194.png, css/images/sprites-dark-thinner.svg, css/images/sprites-light-thinner.svg, css/images/preloader.gif, css/images/sprites-light-thin.svg, css/images/sprites-dark-thin.png, css/images/sprites-dark-thick.png, css/images/sprites-light-thick.png, css/images/sprites-light-thinner.png, css/images/sprites-dark-thick.svg, css/images/sprites-light-thick.svg, css/images/sprites-dark-thin.svg, css/images/sprites.svg, css/images, css/foundation.custom.min.css, css/accordion.less, js/toesslab.js, page_templates/blog_entry.php, page_templates/blank.php, src/Helper/SmXmlToArray.php, src/Helper/OptionsGenerator.php, src/Helper/ThemeObject.php, src/Helper/MclInstaller.php, src/Helper/SupermintTheme.php, src/Helper/Upgrade.php, src/Helper/SmArrayToXml.php, src/Helper/BaseOptionsGenerator.php, src/Helper/ThemeFile.php, src/Helper

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Only when manually removed or the cache is cleared.

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
7.1.22

# PHP Extensions
bcmath, calendar, cgi-fcgi, Core, ctype, curl, date, dom, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imap, intl, json, libxml, mbstring, mcrypt, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, SimpleXML, soap, sockets, SPL, sqlite3, standard, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 300
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 10000
memory_limit - 320M
post_max_size - 200M
sql.safe_mode - Off
upload_max_filesize - 200M
mysqli.max_links - Unlimited
mysqli.max_persistent - 0
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (X11; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0