Default [Q] I9505 Camera Problems

Good Mording,

i always have problems with the camera from my phone.

When i use the phone more than one day, the camera doesn't work (doesn't show a picture; app very slow and hangs).

If i clear app data, dalvik cache and cache the camera works again but after several hours (0.5 to 5) the camera doesn't work again.

Is this a hardware error from my phone and what can i do against this problem?

How can i provide a log file for the camera application??

Phone specs:
Bootloader: MGA without KNOX
PDA: XXUFNB9 (4.4.2) (Goldeneye V23)
Modem: XXUFNB8
Kernel: Talexop
Other Problems: none since android 4.3 (except with old MGA Firmware (4.2.2) the phone had lags because of the sd card)

I tried also CM11 last week and i had the same problem after several minutes.

Many thanks in advance.

Alex