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Your levels look fine. Are you having the issue while directly connected via ethernet? What are the lights on the modem doing when you lose connection? Can you post your error/event log pls?
I have been losing connection about 3 times a day. I looked at my cable connection from in the modem in which I have attached to screenshots.
Please let me know if you see anything out of the ordinary. I did read that the power on the downstream side should be + or - 7.