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c7100v firmware v 2.01.42 internet and phone issue .
I have a C7100V firmware V2.01.42 cable modem router with phone connected to comcast. Every couple days or so the Wi Fi slows way down and the phone starts chopping/cutting in and out the incoming vo...
Its worth a shot. It shouldn't necessarily cause the issue your having but having the network setup right is only going to be beneficial for troubleshooting.
What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and any unused channel on 5Ghz.
Any Wifi Neighbors near by? If so, how many?
Have the ISP check the signal and line quality UP to the modem.
Be sure there are not coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.