Stickup Cam Night Vision not working when outside

So as the subject says, when outside the night vision doesn't work on one of my cameras, but when I bring it in an put it in a dark cupboard the night vision seems to kick in just fine. It was absolutly fine where it was for a week or two and with no changes it has now decided to not record in night vision at night making having it pointless as the point of getting it was to see what animals wander about the garden at night. Basically for a week I ahve motion event recorded as darkness, clearly it is seeing stuff as it is starting to record but the night vision isn't working right to actually record it. Ihowever move the camera instead and the night visio works in a cupboard so I am very confused as to what to do.