We also had 2 of our 3 CCR1036's fail at exactly 00:00 GMT (01:00 BST).
1 CCR1036 stayed online however.
They are on 6.27.
We can only bring them back online with a hard power cycle.
The LCD screen would not light up, and no traffic to or from the router.
NTP was configured on all.
Everything is back online now, but it appears very coincental that they both went offline at the same time after 00:00 GMT.