Images sometimes do not load at all or only partially

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Hello,
I created a Website with Conrete5 version 8.1 which worked correctly the last 2 months. Since a couple of days the images (background and content) sometimes do not load or they only load partially (so only the upper part of the images is shown). Sometimes even the .css and .js files are not loaded (Safari says: „Failed to load ressource: The network connection was lost.“), so the page looks really messed up. If I try to load the page a couple of minutes later, sometimes everything returns to normal and the page displays correctly. Another couple of minute later the page again fails to load the resources (mostly the images) and is totally messed up again.
The webiste is located here:http://www.unicorner-phsg.de
In the attached image a screenshot of Safari and Firefox is displayed. Other users (Windows, Firefox & Internet Explorer) are also reporting the same problem.
Is this a problem with Concrete5 or is this a problem with the hosting company and what could be the solution?

Thanks in advance.

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MrKDilkington replied on at Permalink Best Answer Reply
MrKDilkington
Hi cmcc5,

Some of the page assets are returning errors:
GET http://www.unicorner-phsg.de/application/files/cache/css/elemental/main.css?ts=1507412755 net::ERR_EMPTY_RESPONSE
GET http://www.unicorner-phsg.de/concrete/themes/elemental/css/bootstrap-modified.css net::ERR_CONTENT_LENGTH_MISMATCH
GET http://www.unicorner-phsg.de/concrete/js/jquery.js net::ERR_CONTENT_LENGTH_MISMATCH
GET http://www.unicorner-phsg.de/application/files/8214/9867/3629/Titelbild_rd.png net::ERR_CONTENT_LENGTH_MISMATCH

Here is a result from an internet search for one of the errors:
https://stackoverflow.com/questions/23521839/failed-to-load-resource...

I would contact your web host about this.
cmcc5 replied on at Permalink Reply
Hello and thanks for your reply. I contacted the web hosting company and while they only sent an automatic reply (that they got my message etc...) it seems that they fixed the problem already.