I was 13 minutes into a run this morning and I hit the button on my iPod Touch to get a split when instead of getting feedback on my time, distance and pace, the timing had stopped. Thinking I'd accidentally paused the "workout" I hit the green button only to have the iPod start looking for the sensor. I assumed the sensor had died and continued my run - fortunately I'd started my wrist stopwatch so I was still able to time my run (a personal best). I was hoping that at least the splits to the point that it died but it was all gone from the iPod by the time I got home.
After playing with the iPod at home, I'm now wondering if maybe it was the iPod that messed up (as the Nike app was doing weird things). I powered the iPod off and on again (which I had done before this and every run) and now it can talk to the sensor.
So... how long does a sensor normally last? Could it be on its way out, or should it have plenty of life left?
I haven't uploaded all of my runs to Nike+, but there wouldn't be more that 20 km missing - so I've done around 260 miles/420km, maybe 32 hours all around 8 months.