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Thanks for your reply. I'm still riding my 9.8 regularly and, lately, about 75% of the time there is no speed sensor issue, but I still sometimes have the problem I described above. Fortunately, I have not had the huge boost you did -- sorry about that situation...

UPDATE: I am wrong about a 15 MPH threshold. Today, the speed fluctuated in the 4-7 MPH range. I think it's probably been doing this all along but I never noticed because a) the speed is low enough that the motor never cut out, and b) usually at these slower speeds I'm not looking at my speed...

I don't see how that could happen. At 14.5 MPH all is good and then at 15MPH I start to see all of these speed fluctuations.

I have a 2021 Trek Rail with the latest Bosch Performance CX software update, and have a similar problem. Once I get to ~15 MPH, the Kiox display shows random speeds in quick succession. Below 15 MPH it seems to report accurate speeds. Whenever the (misreported) speed exceeds 20 MPH (US limit)...