Slow uploads during the daytime

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Thanks - added a link.

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?

The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

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.

@EG I've linked the modem stats, but since my speeds are great in non-work hours, the modem (and router) should be fine.

@bskitz Yes I believe xfinity upload is generally congested in my area due to work-from-home & remote school, and I'm asking them to fix it. Xfinity continues to sell 300/10, knowing that they're only delivering 300/1 during the day, at least in this area.

The modem is Motorola MB7621 with these stats:

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 and (external link) 

The issue could also be a capacity / traffic congestion problem but that won't cause a rise in the upstream power level. The stats don't lie. It is elevated and it may be intermittently fluctuating even farther out of spec, and this should be addressed regardless of anything else. Did any of the troubleshooting suggestions apply ?

@EG OK upstream power may be on high side; I've no expertise here. But I don't think the upstream power gremlins know to behave at lunch time on work days. And to take Labor Day off. I.e. seems more likely Xfinity congestion in my area.

I'm seeing a similar behavior for the past 3 weeks or so. My neighbors ran into the same problem. We had Comcast technicians take a look inside the home and at the boxes on the street. Everything is in order and their conclusion was that this slowdown is coming from backend servers.

Comcast is throttling the upload speeds due to increased traffic of work from home and schooling. They need to increase capacity or they will lose more customers soon.