Whenever I wear my HR strap with my PM it only picks up randomly. It'll go 10 minutes without reading, and then read it for a minute, and then cut out again for a bit. So I never actually get real readings, hence I don't wear it anymore. Is there something that I'm doing wrong to cause this? Do you have to calibrate the strap to the computer somehow? I never really put much thought in to it, but I've considered wearing it lately so I guess I should figure it out. I have a wired PT and the standard cycleops computer as well.