upgraded from 3.9 to 3.10 (rb 333)
jan/01/1970 01:00:06 system,info installed routeros-powerpc-3.10
jan/01/1970 01:00:06 system,error,critical System rebooted because of kernel failure
jan/01/1970 01:00:06 system,info router rebooted
next reboot and device working good (i think) ;]