The phone started to lag a lot, open keyboard display lits up after a few seconds. No incomming calls nor smses. After reboot several texts and missed calls notifications. 2.5G connection in the status, not a sign of dead network.

I've installed camkeyd last friday and suspected it. the other suspect is unstopped alarm. i was away from the phone when the alarm started and haven't stopped it for about 5 hours.

before rebooting checked with htop processes only evolution-address.. was getting about 15% cpu every few seconds.