have another modem on hand? At first I thought Embarq was having major problems in my area....as soon as I changed out my modem the issues stopped...so it looks like the modem fried.
just an update to my last post; my modem was fine; turns out there was a 1000 foot bridge that shouldn't have existed on my line that was causing the modem to build up line errors, over time, then repeatedly lose sync.