Try calling tech support. It's a much better solution and usually the first thing to do.
Odds are if it's just one box it could be a couple of things including a bad connection to the modem (more likely on coax connections or HPNA). Could be a box issue potentially also.
If you find a post useful, please give the author a "Like" or mark as an accepted solution if it solves your trouble. 🙂
