I've updated the firmware in my PM5 this past month (there were 2 updates) and ever since, my Garmin HR monitor is spiking. It seems reasonable for me for the first one or two intervals, but then during rest intervals, where I tend to increase SPM but not effort, it spikes. For instance, my 1000m cool down it climbed to 194bpm. Based on past data, I should have been down to 120 or less. My watch confirms that when I stopped my session, there was a difference of 50 between the watch and the PM5
Normally, I don't really get above a HR of 150 bpm because I tend to burn out or get sloppy.

Is anyone else seeing this?
Thanks