Track IR doesn't track anymore

[QuiGon]

I'm using my Track IR 5 for almost 7 years now and it worked absolutly fine all these years, but now it suddenly causes trouble. :(

 

For some reason it doesn't track anymore, despite picking up the 3 reflectors of the TrackClip (see screenshot). If the TrackClip is positioned perfectly straight and level at the camera, it does still work (reflections being shown green) but as soon as I tilt the TackClip very slight the reflections turn red and it stops tracking my head position.

 

Anyone know what's going on there? I would understand it, if it wouldn't be able to pick up the TrackClip's reflections anymore (e.g. when tilted too much), but all 3 reflections are still clearly visible to the camera as can be seen in the attached screenshot. :dunno: