Wired Theme-CSS-Caching behaviour

I did some changes in the CSS files of some Blocks. (copied it to application folder first) Testimonial is one of it. Everything is showing up fine. After about a day, the old style is showing up. Clearing Cache is fixing it again for an day. Disabling theme css cache is fixing it completely, but i want to turn this caching on again. Another wired thing is, that i tried to change the CSS files also in the concrete folder (in updates as well) and this blocks are not modified by the theme i use. So there is actually nowhere the "original" css file which is showing up after day with them css cache on.

What do i miss?

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shaolinsteyr1 replied on at Permalink Reply
Ok, found out, that after the day the block is shown without css.
shaolinsteyr1 replied on at Permalink Reply
it is also happening with java script and the java script cache for one block.