Temperature rise when not looking at a channel?

Hello, so we have a strange problem where if we are not looking at a channel on the scanner the temperature will rise quite a bit. This is for a lakeshore 372 with the 3726 scanner looking at RuO at around 20 mK.

We can go from a 10kOhm reading to 7-8 just by switching to another channel and switching back.

We suspect a grounding issue/pickup on the lines between the scanner and the fridge, but I was wondering if anyone had seen this before and had a solution or if there was more information about what the scanner is doing to the lines when it is not looking at them.

Thank you very much