First of all, my excuses for this late update... Quick summary:

I mailed several times with support discussing what to try. Then Walter van Loon offered his assistance (not to forget Henno ) to try his player in my car. That pointed out the problem to reside in my player. It was repaired very quickly. I was without it for 3 (working days). All is working fine again, thanks guys!

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Edwin de Vaan