My watch, recently updated to SW 6.20, will restart during a strength activity between sets with auto set enabled.
It occurs when I’m in the Work mode then it senses reps. If I’m in Rest then start doin reps, it switches to Work mode. But if I’m in work mode and start doing reps, it will restart and pause my activity.
Auto-set is pretty worthless anyway. Never counts reps correctly and rarely switches to work mode to begin with.