I was trying to catch error from topics either debug or kvm without success. I can provide more detailed problem if it will be necessary, but I will need to know how to gather more detailed logs.
Current logs:
21:19:14 system,error,critical System rebooted because of kernel failure
21:19:15 system,error,critical CRIT: System rebooted because of kernel failure
21:19:15 system,error,critical ERR : System rebooted because of kernel failure
21:19:15 system,error,critical router was rebooted without proper shutdown
21:19:15 system,error,critical CRIT: router was rebooted without proper shutdown
21:19:15 system,error,critical ERR : router was rebooted without proper shutdown