Also been having problems (random dropped calls, garbled calls, dial a number and dead air) for the past few weeks. Thought it might be due to the new features being put in. Grandstream HT502, ~5mb/2mb Cox on Motorola SB5101, WRT54GL with ports forwarded and on the Exempt QOS mode... and just made the Grandstream the DMZ host for the hell of it. Resetting the cable modem fixes everything temporarily... nothing feels like it's overheating... WTH