My 655 is Hardware Version: B1 Firmware Version: 2.11NA
I upgraded it from 2.10 because of this problem, but it didn't change things.
The router just reboots over and over. However it seems related to traffic. I have 4 kids and myself that are all using it, sometimes at the same time. Also there are 2 IP cameras tied to it. I've been fighting this since I got it 3 months ago but have not found a solution on my own. I've tried shutting down the cameras and no luck (one wireless). Yesterday, it rebooted once and hardly before it was up again, it rebooted again! I turned the unit on its side and ran a fan on it cause it was pretty warm, but over the next few hours, it rebooted 3 times.
At that point I turned off the wireless completely. Now I don't have solid proof yet, but it hasn't rebooted once since then. I turned on wireless once for a few minutes, and only I was using the router, and it rebooted after 30 minutes of me being connected wirelessly. So I'm not positive its because of the wireless yet. I've put the wireless on a schedule so it's not up during our higher traffic times: afternoon and evenings. However it should not be this way. I'm almost ready to get another like one, and see if it's inherent in the whole model line or what.
I'm tied to a Motorola Cable Modem SB6141 with 10/50 Comcast service. I've seen the cable modem lose signal just a few times, but the router does not reset when that happens.
Not sure what to do at this point.