Interference With Polar Heart Rate Monitor?

I use a treadmill at home and have now been getting "00" readouts on my Polar F7 Heart Rate Monitor, even though I'm moving at a good clip, the chest strap is both taut and well-moistened and has a fresh battery. The wrist receiver/watch seems to be functioning OK, out of the exercise area...

The treadmill is about eight feet from a wireless router--could the router be interfering with the HRM function?

Moving either the router or the treadmill aren't options, as I live in an apartment and the treadmill is both large and
heavy....

Thanks for any feedback.
 
Yesterday I re-moistened the transmitter belt immediately before training, and the wrist readouts appeared after a minute or so, then functioned normally...

So, the Polar F7 does appear to be well-coded against RF interference (and the wireless router isn't the villain here)--but the new Polar chest strap doesn't hold moisture as well as the previous one did.
 
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