Power levels had been quite stable (almost boring) for the last several weeks.
Then starting Friday afternoon, things started getting shaky.
http://i.imgur.com/PCM0m0m.png
Upstream levels maxing out at 55.2dB for a few hours at a time, followed by a sudden drop off and unstable wavering. Accompanied by intermittent loss of internet throughout the weekend, and continuing even now.
During all this time, downstream levels and SNR remained 'normal'.
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