Been having lots of drops for several months now. Upgraded service plan (600 Mbps), new modem (Netgear CM700), and Google Nest WiFi system.
The upstream power is on the high side and the downstream power is on the low / weak side and they may be intermittently fluctuating even farther to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
Good luck with it ! Please post back with how things turn out.
Tech came out yesterday and removed some sort of interference prevention device installed where the cable to my house connects to the pole. Upstream channels went from 1 to 4 and things were much improved yesterday. However, still having frequent drops again today. I just checked my router connection (below) and seeing lots of uncorrectibles. Not sure if this indicates an ongoing issue.
Hmmm.... A bit better but the downstream is still on the weak side. The intermittent fluctuations may still be happening. Looks like more work needs to be done.
Thanks EG. Can the Xfinity support/techs see these event logs remotely when I call, or do I need to explain to them what I'm seeing? Not sure how to best relay the necessary information.