I ordered the heart rate monitor from Amazon, and was pretty happy with it. Except, after two weeks, I started either not having a heart rate, or working so hard that it would be about 240 bpm. And always the same number, whatever it was, in that range, or no reading at all. I tried replacing the battery, but to no avail. Oddly, though, the battery compartment had some kind of awful goo. I sent it back to Amazon, and the new one hasn't given me trouble since. It sounds like we were having the same problem, though.
I hadn't noticed any impact from the wind, but I've usually had a jacket on. And I use a merino ( wool ) base layer, which seems to keep static out of my way.