AeroPod, PowerPod and Newton

Does anyone use their newton for sprint races ? If yes what do you do when the unit is off when you come out of the water ? I recently did a half ironman and the unit was off, I turned it on but had to do scan to find my speed sensor and HR but it was finding units from other bikes as well, now for the half my transition time is 3 min and chance but for sprint it is 1 min and change, no time time to turn on and scan, any way to keep the newton from turning off while swimming.
Thanks for any input.
Jeff