I went out yesterday in 80- deg temp. Was doing O K and I didn't pickup any signal for a while. When I looked at the detector it had powered off. I turned it back on and went about my business and in about five minutes it shut off again. This went on for about 15 minutes an gave up. The batteries are new. I even put the second set of new ones in. I tried to tap the control and it wouldn't shut off. Any ideas? Thanks. Dirty Don