Random heart spikes on my A2770 watch

I see others have gotten random spikes, how can you tell if the sensor is faulty?

The first time it happened over a year ago I happened to be medically assessed. It was taken seriously. I was seen multiple times by a cardiologist, did stress tests and more recently had to wear a holter monitor for a week. I am getting more frequent spikes, I started wearing a heart strap while rowing and both seem to be in sync until the watch shows a spike of 202-210. The Strava analysis doesn’t show anything abnormal. It seems I’ve been medically treated for a possible malfunction?