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Netgear Nighthawk CM1100 DOCSIS 3.1 Cable Modem
I got the cm1100 cable modem docsis 3.1 from amazon and it works but there wierd thing happen regulary the internet stop working then for some minutes reboot it self back on as I keep seeing the mode...
your dns shouldn't impact this. You can try going back to the providers to see if it'll help but doubtful. Always worth a shot when you're troubleshooting though.
yes your coax cable. Your isp is responsible up until it enters your house. Best bet with testing modems is to have it directly connected where it enters the house. this reduces the chances of bad cables/adapters/etc. Doesn't mean the cable doesn't have an issue but it reduces the odds of it.
How does the cables and coax look of comcast as my home had others as dish tv and comcast.
Everyone's box can be different depending on how comcast did it. It usually has a box mounted to the outside with the coax coming into the house. outside of your home, its comcast's property and they're responsible for it. Once it enters your house, its your responsibility. so check where it comes in and hook up there.
Is it wierd it did it againg i just turn off the modem and turn it on with power button in the back when the problem happen as force rebooting it to turn it on as fix internet in secons as if i let it self do it it will take like 3 to 5 minutes.