Power cycled my router, no change. Factory default, no change. Power cycle ONT, comes back.
Seems to be a recurring issue for me, but I'm also on MOCA using 20 year old coax with splitters and barrels because the installer didn't want to run CAT5 between two attics.
(I was down from between 04:01am and 04:31am and had 13 down notices (6.5 hours)