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Batteries are possibly suspect - bought from LBS that had them in bulk and sold cheaply.
I'll give a supermarket bought Duracell a go and see what happens.Have read about the theories about the magnet leaving the sensor 'on' and draining the battery. However had the initial battery in there for a year or so without taking any care about magnet/sensor alignment and all was well.
I don't use any sensors. I recall from Polar days that there was a dip switch in the speed sensors that you could set to boost the signal strength - you didn't alter that did you?
Leaving bike with magnet near the sensor can drain it quickly too.
It's most likely batteries though - did you buy quality ones or cheapies? Even quality ones could've been old or something.
https://forums.garmin.com/showthread.php?65572-Speed-Cadence-GSC-10-eats-batteries
http://www.bikeforums.net/road-cycling/776166-garmin-cadence-sensor-battery-drain.html