I have three of them right now. If you are in an area with some heavy heat right now that may be part of the problem. What I would also do is have it set to three picture bursts. Then click on the three pictures pretty fast and see if you see a lot of grass or branches move from the 1st picture to the 3rd. If you see a lot of movement in the grass, it may be enough to trigger the camera. Also, even though the grass may be cleared in front of the camera, make sure you don't have some that blows in front of the camera when you get a good shot of wind. A branch or a close piece of long grass could cause it to trigger.

I have to think the grass is somehow triggering it though. I haven't had a problem with the two I bought last year. Here is a quick pic of one I got last week, first buck I've seen in forever on my urban hunting spot.