I have not yet updated to the 1.21b02 firmware (about to); still on 1.20, and getting the freezes every 24 hours or so). However, I wanted to point out that when the internet drops / router locks-up, and I goto the device itself and cycle through the options on the led screen with the physical buttons, it will reboot automatically when I cycle to the date/time section; figured I would share that symptom as hopefully it may lead to the root of the problem. Model is A1.