I have the latest software (20.32). This morning's workout (using wrist heart rate) was 4 miles EZ + 2 x 9 Drills + 2 miles w-6 x (0:20 Stride + 0:20 Recovery). About the 6th drill, the incident detection started, but I was rested and feeling just fine, so I stopped it from sending. But as I was wrapping up with drill 9, it started again. But when I pressed the buttons to stop sending, it kicked me out of my workout.
Also, it is my vibe over the years that I have had the FR955; its wrist-based heart rate doesn't sync up with reality. A couple of years ago, I was a half-mile into an easy run, and it alerted me that my heart rate was 178 bpm and that I may need to stop to breathe. I was just fine and continued with my easy run.
Anyway, there was no reason to kick off incident detection this morning. If you want me to actually set up incident detection, then I believe you need to work on the wrist heart rate sensitivity or calibration.