100 mbps service, new modem (MB8600) in March. Everything fine during online school / WFH through mid-June, and I recall there was an outage / some area work around that time. Since then seeing consistent sustained speed drops for past ~5 weeks with DL of only ~30mbps, but upload speeds are unaffected (~6mpbs). The ONLY thing that works, is power cycling or resetting the modem, but this only lasts for a few hours to a couple days. Restarting the router has no effect. It "feels" like plain old throttling somewhere.
Initial setup / info
Things that have been tried
Only thing Xfinity techs have left to do is place an Xfinity modem/router, which is happening Saturday, though I suspect that can not overcome whatever is causing this.
Has anyone else experienced this behavior, and if so, what was the resolution?
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We've been having the same issue for the past couple weeks (south east NH), 300/mbps service. Power cycling the modem (sometimes wait 20-30 min before powering back up) will get the speeds back up but after a few hrs they drop down. Speed tests from vaious sites show it's usually down to 30-60/mbps, one site showed it was 1.6/mbps.
Have an sb8200 modem, power levels are within spec (usually -0.9 to -1.9) but notice there seem to always be 2-3 that show 0.
Another weird thing is 3 times in the past 2 weeks the ip address given to the modem has changed. They have stayed the same for 9-12+ months in the past.