Download Speed Degraded / Upload is Good
I have the xFinity Gigabit speed tier. When I ran speedtests in the past, they were always at or near 1 Gbps.
In the past few weeks, I am seeing that it never gets above 210 Mbps download. Upload speed is great at 35+ Mbps. I have tried all sorts of tests, including connecting my computer directly to my SB8200 modem. That one is almost 3 years old. Not sure if it is dying.
Signal levels look great to me:
Comcast support says all test are green and good. But something is wrong.
We even swapped out the SB8200 for an old Arris modem I have. It is a 8 x 4 channel modem, so nowhere near the 32 x 8 channel capacity, BUT it was actually consistent around 238 Mbps.
So, does this look like a bad modem? I have tried the speed tests from different computers (with WIRED connection), cell phones, etc. It starts the download test at 400+ and then dies down quickly to less than 200 Mbps.