Today, which is when I added the monitor, it showed that I stayed at a 30 for almost a minute, then went to a 0 for a couple of seconds, and then slowly climbed
back up to a 40, 41, 50... then it spiked again at a 200. After my run, as I was cooling down (which I obviously stopped running right away), I remained at a 187-193 until turning the treadmill off. Even while stretching I found I stayed at a 180, and at one point I dropped to a 106 then back to a 180-something again...