Connectivity Issues

Recently upgraded modems. I ended up with a Netgear CM500. Worked flawlessly for about two weeks then started disconnecting multiple times a day. Some days more than others. Queue vacation, so I didn't bother digging too deeply and thought it might be a hardware issue. Queue return and the same problems persist despite working through troubleshooting, etc. From what I can tell it's related to upload power issues. I dropped a new, direct line (quad-shield RG6) from the demarc box to the modem, checked all fittings, etc. but the problem persists. Any insights would be appreciated.