Hi, spotted today on a ride my cadence jumped from 80 to 96, to 80, to 96. Appreciate over a minute its 1 rpm per few secs but its driving me crazy. Ive a low cadence interval to do this week and not sure ill keep 55rpm since its either 80 or 96 on the menu! Help!!@
Provision of help will require you to provide details of your setup. 
also, it doesn’t matter what your cadence is in workout mode, you will still get the star as long as the power target is achieved, cadence has no impact.
Since a low cadence is essential in a low cadence workout … if you use a cadence sensor a new battery might do the trick … ?
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The sensor is on the bike. I understand the issue might be fixed by turning off bike then leaving off a few mins
Wattbike Atom? If so - yeah, that’ll sort it
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I have this same issue. But mine jumps from 79 to 112 and 122! I can’t follow the workout as it is always telling me either to speed up or slow down. I have my own bike on a wahoo kickr core 6 with the zwift cog.
Wahoo trainers don’t measure crank arm revolutions, they estimate cadence but that doesn’t work for everyone so installing a cadence sensor is sometimes necessary. Here’s a previous discussion about it: