Hello:
I have the same problem with an ASR1001, but a different IOS:
System returned to ROM by reload at 00:30:43 METDST Fri May 18 2018
System restarted at 12:08:43 METDST Tue Sep 4 2018
System image file is "bootflash:/asr1001-universalk9.03.10.00a.S.153-3.S0a-ext.bin"
Last reload reason: Watchdog