I recently built my first game cam. The camera keeps locking up on me. If I turn the cam off then back on it will flash (no film advance) then lock up. If I turn off & on again - same thing. I replaced the batteries & this seemed to fix the problem. I put the cam in the woods. 3 days and 4 pic's later - the cam is locked up again. Is it batteries? If so, any idea why it is using the batteries so fast? How can I fix it?