I’ve also seen this issue pop up recently. I am not sure where the issue is coming from. It might be time to tweak the PID controller variables on the Arduino code again. Some of the software might have changed within the last year such that we need to revisit that again to re-optimize.
I don’t have immediate time to do it right now, but if you want to try yourselves, the Arduino code is there. Just follow the tutorial and upload to the U2 controller. (When opening the hood, should be 2nd controller from the right to left. U1 should be stirring)