Panoramic Modem/Router set to bridge mode keeps rebooting periodically

My modem is probably 3 months old. About 3 weeks ago it started rebooting itself for no apparent reason.

I have it set in Bridge mode so I can use my own firewall and router.

I've noticed my upstream signal on all channels are 52 or greater. Is that a problem?

I also don't get full gigabit service... probably more like 500Mb.

Any ideas?

When I check with whatismyip.com i get a different cox ip address from what the internals of the cox modem says... both are cox ip addresses. not internal ones since it is in bridge more I expected them both to be the same.

Any chance that is a problem?