Default [Q] Sony Xperia P kernel panic - Why?

I have Sony Xperia P with latest stock firmware (Android 4.1.2 - 6.2.A.1.100).
My phone restarts at random, in average once a day. I've tried factory reset, downgrade to previous stock firmware, clearing all cache, but nothing helped.

So now I've installed a custom kernel (Nemesis v6.3), hoping it will resolve the problem, but it didn't.

Could anybody look at the attached crash log, and understand the reason for the crash?

Attached Files
File Type: txt Xperia_P_Nemesis_crash.txt - [Click for QR Code] (128.0 KB, 1 views)