Ive had my garmin watch for almost a year. At first it was pretty accurate, but just this year I’ve noticed it’s almost never accurate when it comes to heart rate. See picture below. I was finished exercising and sitting down saw it read 158 took my heart rate on an app on my phone said 85 that’s a drastic difference now can that even be possible. I’ve reset it several times and it’s up today on all software. Even when I’m not exercising it just stops reading for no reason. Is there a fix for this
