Losing modem connection daily
I started Xfinity service 3 months ago after moving into a new apartment. Since then, I have had internet disruptions about once per day, lasting for 3-4 minutes each time. This week it's gotten worse, now it's happening 5-10 times per day. Each time, I am unable to ping the modem at 192.168.100.1. After 3-4 minutes it comes back. This never happens in the morning, only after noon.
Connectivity within the LAN is solid, no issues there. All my devices are on 1GbE, no wireless. I've asked for a technician to come check it out soon, but I'm wondering what could cause this. I think if it were excessive noise on the coax then I should still be able to ping the modem. Before moving here, I used this modem with Spectrum for 3 years and never had any issues, so I think the modem is okay. Could the modem be receiving some kind of bad signal that knocks it out temporarily? I check the modem log right after it comes back and it does not show a reboot.
The modem is Motorola SB6141. According to this article, the upstream power level should be between 45 - 51 dBmV. Mine is usually around 42 dBmV. Not sure if that matters. I have checked the modem power supply and it's steady 12.2V. There are some uncorrectable codewords but I don't know how many is acceptable.