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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...
You have a lot of uncorrectables plus the dynamic range window violation. dynamic range window violation is usually when you're power difference exceeds 12dB. Most usually there's a fault in the line with either a cable, connector, amplifier, etc.
Here's what I'd do for troubleshooting.
1. remove any splitters from the line. (you're power might be a bit to high but its for testing purposes)
2. check all your cables. Make sure the connectors are all good and inspect the cables. I've had a small nick in one give me errors that weren't resolved until I replaced the cable.
3. Hook the modem up directly where it comes into the house. Try not to use any splitters. Just direct connection.
How is the cm1100 wired? CM1100--->Router--Computer? Hopefully. make sure you're not using the 2nd port on the cm1100
I dont use spiltters or adapters there both next to each other and not sure about the cables having problems I got the internet cables from amazon cat6a
https://www.amazon.com/gp/product/B00HEM5MZU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Your coax cables. check these You strength coming in and snr look good but your getting the dynamic range window violation in your logs which usually means you're getting >12dB difference in strengths. Maybe something is spiking/erroring. Again, check your coaxial cables for damage, bad ends, cheap cables, water damage, etc.
Does it matter I use dsn 1.1.1.1 cloudflare and this cable you mean outside my home
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.