The modem just may be too sensitive to noise.
The tech found no issues when he was here.
Lines are good and the modem was running perfect.
Of course it had the issue 5 hours later
The Arris handles a wide range of frequencies- cable modulation, telephone conversion, wifi.
So its having to deal with frequency range in the low KHz to high GHz and because FCC requires these devices to accept interference and not cause interference, this wide range means the modem is going to very sensitive to any noise.
So you really end up needing near perfect wiring to cover your responsibilities.
In the end I have new connectors, fully soldered splitters (for shielding), verified grounding, terminated jacks.
The issue still happens.
Note that if you are having similar issues and have verified all your side, then you are good, theres not much else you can do than going with another modem like cableonehs suggested that may be less sensitive.
All it takes is noise from outside your house to cause this issue.
For example, many new video cards operate at the same frequencies as the cable modem, so if a neighbor has a PC with that type of video card and has a TV tuner in the same PC, its very possible for their video card to bleed a signal into the cable system and cause the problem.
I have even read where after a Uverse conversion the cable company did not disconnect their side of the tap, so the uverse tuner was broadcasting down the node.
The only real solution is for the cable company to be proactive
and since their side is already logging the connections, cross reference the locations of the bad signals and audit that node.