Optoflow sensor stops...

Hello all. I have this issue on 2 quads running 2.8.1 on APM2.5. Sensor will just stop sending data. I noticed that first when I was adjusting focus on the lens and looking at the image, every few seconds I would have to restart the program to get few more images and it would stop again. After loading 2.8.1 and in CLI I can see dx and dy change for about 5-20 seconds but it always stops. The sensor has been connected as described here (for APM 2.5): 

http://code.google.com/p/arducopter/wiki/AC2_OptFlow

 

5V trace has been cut and 3.3V has been jumped in. The same issue is happening on two quads. Anyone have any idea what's going on? Seems to fly ok otherwise.

 

Thanks,

 

Miro

 

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