Default [Q] Apps crash after screen unlock, please help.

Hi everybody. I bought my g pro in december 2013 and haven't had any major issues up until now. The issue at hand is as follows:
- very often when I start an app that can work under lock screen, it works fine but when I swipe to unlock my screen it crashes/disappears. It happens to my recorder app, utorrent and other apps, also
- if there are any notifications like new SMS,facebook, viber and other message notifitions, they disappear (which is quite annoying).
My phone is e988 Taiwanese version, never rooted, stock android 4.1.2, BUT updated OverTheAir to the only 10b update (which is still 4.1.2). Please help and thanx in advance
greets from manganoid
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