zen navigator wrote:Thanks for all the tips. I think the sensor is dodgy, as it doesn't matter where I position it or how damp it is, it drops out after 15 minutes. It is old, so off to the shop to get it looked at (or a new one).
May well be the battery just needs replacing.
Download the repair form from here: http://www.pursuit-performance.com.au/polar-service-information.html and then just pop it in the post. I've often sent the watch part as well so they can test the battery in that too.