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This has recently started happening on my Zumo, it used to be pretty stable. There is no way a I wouldn't notice a 40w power difference due to pedal strokes, this would also get a better as cadence increases, which I don't see.

Mine is doing exactly the same thing, tried calibrating it, firmware all up to date. Fluctuates on Zwift and on the MyEtraining app.

Extremely frustrating, I can't seem to figure out how people download the TSV file they talk about on the Zwift forums.