sorry to hear that...it could be a malfunction...but i would suggest looking in your users manual....a lot of these kinds of questions can be answered there...it may have an automatic shut off switch, or you may have not set it up properly?

try and set it up at home in your house...walk by it once or twice a day...see if it works...if it does then put it back out in the woods...if not return it to bushnell