Loosing connection and no temp readings with latest Marlin Firmware (bug fix 2.0.x 29-01-2021)

Just a reference point. I'm running what claims to be 2.0.8. (There don't appear to be any differences from 2.0.7, but I'm not doing a compare on every file, so who knows?) I'm watching a temperature tower now. The temperature is a solid line, except at the steps. Then it's a quickly-damped sine wave down to the new temperature. (I found this version on github, when I was looking for CR10 configs. It's running on a BigTreeTech SKR Mini E3 V2.) It helps to set the PID properly, too.

But Octoprint? As soon as I (finally) got it talking to the printer, it's solid. No complaints yet.