Looking around here and seeing similar problems to mine over the years . Firstly, here’s the setup:
Single (brand new) RG6 from ground block to splitter, from there goes to one TV and the modem (Technicolor TC8717).
Symptoms: Loss of internet (both wireless and wired) for 1-2 minutes, but TV continues to work without issues throughout. Logs show that when this happens, the upstream “bonded channels” may go from four to one, upstream power will go up over 54 (this never goes below 51 when things are OK). The RG6 from ground block to splitter was found last week to have a connector and a poorly made plug in it, which was why I renewed it. Oddly, when I found this and made a temporary repair, all was well for three days.