I have only have had the registration issue a few times, the last time was yesterday around noon EST. I rebooted and it has been stable since, and rebooted again after I read the posts suggesting so. I think the problem is with the GS devices as a whole. It appears to attempt to re-register about 20-30 seconds before the expiration and if it fails for whatever reason, it's done and does not try again (or if it does it sends gibberish). Talking to the GS folks on a similar problem that I noticed when I first lost registration several weeks back (line 1 with a different provider failed when line 2 [Voipo] failed to re-register). They have been in contact and I think the next firmware release will address this, but who knows when that will be, they didn't say. Like Tim said sometime back, I don't think the maturity of the GS HT-502 is there yet. That said, with the same GS HT-502 (line 1), I have NEVER lost registration with the other provider.