WiFi keeps dropping and reconnecting every ~2 hours, “MDD Message Timeout”, “Started Unicast Maintenance Ranging”

Hello. I am currently on a 300MBPS plan with Xfinity and I have been using it with a NETGEAR C6220 for over a year now and never had any issues.

Suddenly, over the past few days, I noticed that every 2 hours, the WiFi would drop off for like a minute and then automatically come back on. The timing correlates with the error messages in the router’s “Event Log” where it says “MDD Message Timeout”.

I already had an Xfinity tech come over and inspect the lines, signal-to-noise ratio, power levels, etc and he said that everything was perfect. He said the issue may be with the router.

I dropped $50 to get tech support with NETGEAR, who had me change the channel numbers and even perform a factory reset of the router and reactivate the router with Xfinity, but even that didn’t fix the problem. Their guess is that the router may be faulty. My question is, if the router is faulty, then why does it happen over a fixed time period of 2 hours? It should be more random if it’s a faulty equipment.

Can someone please advise me on this? I work from home and this is making it really difficult to hold meetings. Any help is greatly appreciated.