Re: daily restart of modem
I have a similar circumstance - started a few weeks ago when I upgraded to 1Gbps plan (our promotional plan expired and this was a nearly cost-equivilant switch) and a new Xfinity-owned XB6 gateway (hw details below). After install we couldn't get anywhere near the plan speeds (we'd get about 30Mbps down, 40Mbps up), had many chats with tech support, and eventually after they pushed a refresh started getting 300Mbps down consistently, and up to 700Mbps down (all speeds measured via direct ethernet connection to the gateway). But at that point, started seeing intermittent disconnects throughout the day.
Tech came out, verified in-house wiring, modem install itself, and the wire to the pole are all fine, and was going to have line techs examine further (I don't know if that has happend). Of course the day he was here we were pretty stable and fast. 🙂 After that though, it's a bit random - if I'm getting high speed, I get drops. If I reboot, I may get high speed (and continue drops), or back to 30Mbps but fairly stable. And when very I'm lucky, I'll get both (right now I'm at 293Mbps down and no connection errors for 4 hours), but it'll last a day at most before starting to drop intermittently again. A reboot (or 2 or 3) gets me back in business for about another day.
I've taken to monitoring the connection status from a Linux box that's directly connected to the gateway and also connected to my internal wireless (so I can get to it even if the gateway is down/rebooting). "ping -i 10 -f -n -4 www.google.com" does a nice job - just leave it in a window, it'll ping Google every 10 seconds and print a dot, and then erase that dot as soon as the response comes in. Ideally you get nothing but a blank screen - when the intermittent connection drops hit, it leaves a dot on the screen for every dropped ping. No timestamping with this, but it does a nice job of showing when things have gone downhill, and I can correlate that it's not just google having an issue (when dots start appearing, all internet traffic is pretty much deceased).
The XB6 doesn't have nearly the detailed log folks are showing above (only seeing radio harvester thread start notices and my admin signons). I can try posting downstream/upstream/CM error info if helpful although it doesn't grab as nicely as above.
HW details on the XB6: under the hood it's a Technicolor XB6 version 2.2, BOOT Version:S1TC-126.96.36.199, Core Version:1.0, Model:CGM4140COM, Product Type:XB6, Download Version:Prod_18.1_d31 & Prod_18.1
Any hints, suggestions, or help would be very much appreciated!