Sometime in mid early July my upstream power started showing some serious fluctuations, but still well within acceptable limits. However, this has now gotten to the point where I cannot maintain 3 active upstream channels, and for a last few days the power has remained pegged at the modem's maximum output.
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I should note that despite this, I have not noticed any connectivity problems.... yet.
Downstream SNR has been trending down and the highest frequencies are starting to dip below -10dB power during the heat of the day.
Normally I add or remove 3dB pads as needed during the year to compensate for thermal shifts, but I am now using none. I cant help the levels at my end any further.
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