What is the problem?
From a cold start, loading a file and printing creates jitter via drag/drop or Cura direct.
Temperature graphs go from smooth arcs to jittery. Prints will not start because range of jump is higher than the allowable tolerances.
What did you already try to solve it?
This has been very elusive. First it happened on random occasion and a reboot of both systems seem to fix it.
I've also figured out that if I have Octoprint set the temperature at the desired print starts often a print will start w/o issue.
edit: I want to add, often when this problem gets 'smoothed' out it will stay that way until I reboot. I can print directly w/o issue, load files cold, it doesn't seem to go jittery again. It's seems to be a fresh system issue. I'm actively trying to observe this more to see if it creeps back in during a non-reset period.
Octoprint log: https://www.dropbox.com/s/pe9cbwev2igm3sm/octoprint.log?dl=0
Screenshot showing temperature stability via Octoprint temperature: https://www.dropbox.com/s/169ruouk6k3jz7a/Screenshot%202020-01-21%2011.48.09.png?dl=0
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)
Artillery Sidewinder X1 v3 running Marlin 2
OctoPrint 1.4.0rc3 running on OctoPi 0.17.0