Critical Modem Error: "Started Unicast Maintenance Ranging - No Response received - T3 time-out"
I appear to be having issues with a NETGEAR CM1150V modem (or the upstream wiring). This is my second modem after trying the Xfinity recommended Motorola . I use cable TV, internet, and voice connections. Orbi mesh network for WiFi.
Currently paying for the 1 Gbps package and am receiving a sluggish, high latency ~50 Mbps on average. The Xfinity Status Center displays "We're having trouble finding a signal", my wife's work laptop drops internet frequently (no other devices drop the wifi signal), and the modem has "Started Unicast Maintenance Ranging - No Response received - T3 time-out" errors all over the event logs.
Any advice on what can be done is appreciated. DSLReports indicates no bufferbloat, Orbi connection seems solid. Modem resets from the Xfinity dashboard don't help. I'm left scratching my head here.