Rock ola selection problem

Hello,

I'm working on a rock ola grand prix
All of the selction are working fine exept all of the A sides in group 8
The B sides are working fine
When i make A-side selection in group 8 the jukebox start searching find the right selection but no seletion is made
The wobbleplate and contacts are clean

Who can help?

It was a weak contact in puch button 8
The jukebox works fine again