Good day

I have a problem with the "famous" Seat Ibiza 2001 car stereo - Grundig High GP99 ( combined with the A/C module ).

As maybe most of you know, it has a common problem with switching on/off when ever it wants, doesn`t matter is the ignition is on or off.
I have made quite a good research about repairing, but still nothing.

I would like to ask - Does somebody know the solution for this radio?
I have looked around the factory schematics, and I found several suspicious elements, but I`m still not sure...

Any help would be useful.

Best regards

p.m. I couldn`t decide which is the right topic, for such a question and I post the topic here. If moderators decide that my question, is not at the right place, please remove it :)