Comcast XFINITY → [Connectivity] Packet Loss when it drops below 20 degrees

I am located in Northern Colorado, I am experiencing packet loss when the temperature drops below 20 degrees. I had a tech out here for this issue and he could not find any physical issues. Anyone know of what might be causing this? Thanks in advance!

Signal levels at this time ?

»puu.sh/lA4rA/320f44a47a.png is this what you're referring to?

The levels of upstream channels at 30.1 and 36.5 MHz are pushing the upper end of the modem's range, and could be occasionally exceeding it.

Can you also provide a screenshot of the Event Log?

Also, all those DS uncorrectables.... hitting every channel.

Mine are similar to his upstream levels (~49dbmv) but upstream actually lowers when it gets colder and downstream rises due to the copper shortening the loop length.

My guess is some device in his line path is malfunctioning when the temperature drops below a certain point like a splitter or amp.

I don't think expansion and contraction have that much effect on loss, so much as the resistance change with temperature causing lower attenuation, resulting in higher downstream power at your modem, and then the modem does not have to transmit at as high of a power level.

Perhaps an amplifier's "automatic gain control" feature, which is supposed to alter gain levels based on outside temperature but, due to malfunction, is failing to do so?

In any case, to the OP, since a tech has supposedly verified that your house wiring has no physical issues, you will unfortunately be at the mercy of Comcast's line engineering dept. to fix this............

thanks for the replies! again experiencing packet loss at 18 degrees
»puu.sh/lBe49/e8a526015e.png
and event log: »puu.sh/lBe7q/2453f6c0b2.png
What do I tell them on the phone as far as trying to get a resolution? I don't want to keep bothering field techs.

Do you talk to any of your neighbors, could you check with them and see if they are having any issues?
If it is a plant issue then your neighbors should be experiencing problems too?
It could be that the tech did not check everything thoroughly, and you have some sort of bad connection that contracts out when it gets could.
Even if it is a plant issue you will need another field tech to come out and escalate the issue to maintenance.

I have a tech coming out in 4 hours. Thanks for all the replies.

Since Comcast techs are late 90% of the time I will mention that you should ask the tech to check the signal levels at the tap. Sometimes they will be lazy and just check it at the drop or grounding block.