Having abit of an on going issue with a 5610. It's set up on the back of a 5330 and is connected to the ICP via an MBG. After much trouble getting it work on the MBG and sip it's now started to cut calls off and crash the router. I have tried 3 routers Belkin, cisco and now on a netgear and they have all acted the same since the introduction of the 5610. Could the 5610 be doing this?