This one is hard. All Apps crash after a day. Please Help!

A

AC Question

I have rooted my android device and messed a little bit around.
Now all the apps start crashing after a day on my Huawei P9 lite. I have Wiped everything, I've flashed it with Huawei stock Rom, installed Antivirus programms and deleted suspicious apps but no, this didn't help. As soon as I open an app, it crashes.
I have to flash my phone everyday with the stock Huawei Rom so my phone works for another day. Please help! I tried everything.