movement is not what triggers the unit, it is the heat of the animal. as for problems I have never used the stealth cam but it is possible there is a problem. go to your search and type in jesses hunting page you will find a section devoted to all game cameras reviews from owners (good and bad about all brands) and hints on there use. good luck. one thing to avoid is cedars they hod heat and then when the wind blows it can trigger the unit.