@WOW_Dan,Thanks.I have my cable box, two additional HDTVs, and my PC with a Hauppauge 1850 TV card connected.
Temporarily hook the modem up to the main connection before any splitters. So the cable comes in, gets grounded, then right to modem. If issues still happen than you know the issue is somewhere outside.
@MrMonk,That is a good idea, I will try that next time it drops out.