RB-450 unexpectedly hangs and watchdog not rebooted it. RouterOS 4.16. In earlier versions (4.13), if device not work, watchdog had rebooted it. Maybe it’s bug of 4.16?
Please generate and send supout.rif or autosupout.rif file to support@mikrotik.com
http://wiki.mikrotik.com/wiki/Manual:Support_Output_File