How many times a day or a week is this happening?
There is a known fault where the power supply gets over current signal incorrect and shuts down.
AFAIK no resets or different firmware will help the problem.
Only new element is new house.
Actually that is major element.. is the modem it is plugged into the same? Are you on the same ISP?
Have you done the full factory reset.. which is always worth a try.
Some areas are prone to slight variations in power.. and by using a UPS you might fix the issue.. expensive to try if it turns out to not be a problem.
As the other guys have suggested a replacement power supply can be a fix if you are DIYer. I have replaced the internal supply with a more robust external supply.. but it is going to require some soldering skills.