It was a new problem.
I downloaded the new firmware which has an auto calibration feature and after a few cycles it got better. The longer I rode the better it got, but it’s still not perfect.
It’s still doing odd things - it will slow me down while descending or quickly slow me down when I stop pedaling. It still feels about 20w off and much harder to maintain speed.
Ill give it a few more rides and let the auto calibration do its thing.