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830 sensor cant find heart monitor after reset

My 830 was dropping all of my sensors .  I did a reset  and updated the software and reinstalled sensors, but the heart sensor (18 months old) can not be "found". I have cleaned it etc.  Could a heart monitor battery be dead after 18 months or is there a deeper problem with the 830?

I also keep getting "Sensor software update" notices but when I try and update, after  waiting a while I get the messages that "Contact failed".

Any advice?