This has happened to me, I noticed that only happens on days in which to set the phone wake up by the alarm. After a few hours the phone gets really slow and unusable, watching the processes by conky I see that the CPU is 100%, and there are various processes 20 to 40%. sorry for english of google translate...

Once it happened that the phone had become unusable, I tried restart and appeared a white screen with green writing: Malfunction, the phone shutdown in 10s O_O

solutions?