Boy that sucks. That is a new problem I haven't heard of. I don't have a stealth cam so I don't even know where to start.
Is there an LED that you can set to blink to do a walk test to see if the motion sensor is picking you up? Or a counter?See if the motion sensoris the problem.
Next, is there a way to manually make the camera take a picture? I know you can do this with Leaf River cams. See if the camera is the problem.

Is the one picture it takes a good picture?