Since I've had the device it sometimes just randomly rebooted without any obvious reason but since it only occured once in a few month i did not investigate this any further.
Yesterday it suddenly got really slow when using some normal apps, nothing special (not like a little slow when the cpu is heavily used, but really really slow) it took about one minute for it to close any app and going back to the home screen etc, everything while still recording my actions so when it became unstuck just doing everything i tried in the meantime really fast, then again blocking. So far so good after a reboot that took 5 minutes (even the boot animation appeared extremely slow and fragmented) everything seemed normal.
Until it just freezed while i tried to make a phone call, during which it never dialed but just displaying the dialing animation, although i could switch back to the home screen and back to the "call" i could not end it or cancel it or anything, the phone behaved normal but the call stayed.
Then i tried rebooting it ...
... now it seems to be a brick, nothing will work it won't start up in any mode neither recovery, nor normal, nor download mode nothing.
After a few hours in the charger (i just left it there) suddenly the (untill then black) screen displayed the charging animation, when i tried to boot it then it just went back to a black screen.
After another hour it just started vibrating out of nowhere (and just stopped when i removed the battery).
Thats it, do you have any ideas on that ?
Some other info on the phone :
- rooted stock rom Android 4.4.2 from Vodafone
- tried adb, odin, but no connection to any pc possible at the moment