[Question] Many apps crashing at the same time,Inew v3+ Miui 7 rom

[nintendo]

Hola!

Since a week i have a really strange problem.

I've had miui 7 rom running on it for about 3 months without any problems.
then i realized that when it was in standby for some time it stays dark with no reaction.(full battery)
when i removed the battery i could start it and it was working for a few hours again.
and sometimes when i do something there are about 4 or 8 apps crashing at the same time and its over again.

i tried 3 rom versions of miui but all works till some point where all crashes and then it is bricked.
with stock rom the same...
but when i flash the preloader with sp flash tools it works again for a while.

i tried formatting all partitions incl. dalvik chache several times but nothing worked.
/data partition is not full..

what i dont understand is why preloader is damaged?

i would be thankfull for any help!


Inew v3+ 16GB
Android 4.4.2
Miui 7 (Global 6.4.7 Beta) Rooted
Cwm Recovery