My old Wahoo chest HRM died a few months ago. I replaced it with a new Tickr X. I could not get the X to keep connected, the reported HR would be stable for about 5 minutes and then slowly drop to a comically low level for a while, and then back up again. It would yoyo like this throughout a 90min workout. I returned that and got a regular Tickr, but the same thing would happen.
Is this normal? I see on other posts that some people don’t use HRM indoors due to interference, but my old wahoo HRM strap had no problems maintaining connection.