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Nighthawk CM1200, slow speeds, partial service
My CM1200 is a little more than a year old, bought for use with RCN Gig Speed internet. The modem has always thrown errors in the logs, mostly this one: Missing BP Configuration Setting TLV Type: ...
you've got line issues.
Your power levels are through the roof. They should be between -7.5 and 7.5dbmv. You're over 15. Way to hot.
they'll need to check lines or turn down their power amplifier for your setup.
Or you can try adding in a 4-6x coax splitter in line to see if that'll drop the power enough. Or a signal attenuator.