New F-Droid App loops

Device OS and version: Android 4.2 rooted (by manufacturer)
Device model/manufacturer: Fairphone 1u
F-Droid version (in the About screen): 1.2
F-Droid privileged extension version (if installed): %

What did you do? (clear steps if possible) updated f-droid client from 1.1 to 1.2

What did you expect to see? update finished without reportet problems, app about to start

What did you see instead? screen went grey, and does so every second or two by itself or whenever I try to start any given app (like settings, etc.). Can not unistall or terminate the app (because the screen is useless). Background processes seem to work though. Home button is also working. According to MyPhoneExplorer CPU load is approx. 25-50% while not touching the Phone, I am used to 5-10%.

BTW: Help appreciated, phone is pretty useless like that.

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