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[Signals] Signal problems started overnight--any ideas?

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Checking my modem levels this morning (was having issues, not related to the modem) and saw these. Downstream levels which are usually closer to 40 are down to the mid 30s (if not lower) while upstream still looks normal, and several "Commanded power in excess of 6db below the value..." errors in the log. Decided to try the modem outside to rule out any inside wiring but I'm getting about the same numbers though the errors aren't there anymore. So this is either something wrong with the line itself or the modem...any ideas? edit to add: MB8600 modem

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