Apple Watch keeps locking and pausing workouts

Hello

I have recently noticed that my Apple Watch is constantly locking itself and pausing workouts. I have tried the following: cleaning the sensor, updating the software, updating my iPhone, wearing short sleeves that do not interfere with the screen and adjusting the setting (auto detection). I’ve also tried wearing it further up and down my arm and adjusting the tightness. Can someone tell me where I’m going wrong please. Thank you.