FW v1.21NA has issues of hanging and or loosing internet connections. Upgrade to v1.22NA and this fixes the issue. I have a A1 HW using v1.22NA and haven't had any issues in hanging or disconnects. Save off your configuration file, Do the FW update, perform a factory reset after the update, then upload the configuration file so you don't have to manually-reconfigure the router. Use FireFox to save off the config file is best. Let us know how this goes.