Apple Watch pausing on bike workout

There is no setting that causes action button to pause the workout.

I will repeat. There is no chance that a button was pressed.

Are you suggesting that by simply shaking the watch, it could cause a button press?

I will also repeat: the watch did not lose contact with the skin. No, I don't have tattoos.

Also, the watch does sometimes stop recording heart rate, but the heart rate gaps do not match with the workout pauses.

I have now turned off all gestures, like double tap, fist clench and such. They didn't work anyway. I haven't gone for another ride yet though. I also run, but I don't get the pausing problem on the run. Running doesn't shake the watch like biking does. BTW, the watch has given me fall alerts when shaking my hand in some ways. It says "did you fall?".