I've owned my cable modems for quite some time now and there are always disconnects here and there.
It was so bad that I had the technician come by to check things out. There is only one cable that goes directly to the modem and the Technician has confirmed all Signals (Downstream and Upstream) are fine. All 24 Downstream channels are about between 1-2 dBmv power and around 37 SNR. Whereas, Upstream channels are all between 43-45 dBmv power.
When the technician was done, I spoke to him and I said regardless of what he did that day. There will still be disconnects. He then blames it on the modem. I've been through different Cable Modems Arris SB6120, SB6121, SB6183, Linksys CM3024 (IntelPUMA), NetGear CM600, Motorolla MB7621. He also blames it on the router which confused me because the disconnect doesn't happen there. The Modem power cycles and/or restarts on its own so I don't know if he knew what he was talking about after that conversation.
All modems intermittently disconnect. Sometimes, once a day and sometimes more than five times a day. So I doubt its a modem issue.
I've been on Twitter and I'm definitely not the only one who is having this issue.
So Xfinity (Comcast) why can't you guys figure out the problem? Maybe go old school and be that cable guy that climbs on the poles and check things out? Just tell me what can you do for me? Is it that hard to ask to maybe re-wire or change/update the cables that's running through the house?