MB8611 Problems

I have been having frequent disconnects with my MB8611. I have tried everything I can to get this thing to work on Xfinity. It disconnects anywhere from two to ten times a day. Had this at a previous house and removed everything between me and feed from the utility pole, no success. I assumed it was the old feed coming down a long dead end road. I have recently moved to a brand new home with a new service with nothing between the MB8611 and the feed coming from the Xfinity box and the problem persists. I got my hands on an old SB6121 and hooked it up for the past 24+ hours I have had no disconnects which doesn't happen with the MB8611. I would say that this is something definitively wrong with the MB8611. I have read that others have had similar issues with the MB8611. Anyone got advice besides scrap the MB8611?