Does the sides near your knees get hot?
If yes then the caps may have come off and blowing hot air into the central console and up to the dashboard and the radio unit then overheats and doesn't operate as it should.
The caps number 8 seem to come off quite easily.
There are 4 ports, it is the ones where number 1 is pointing to, that seem to be blown off particularly when fan is set to high (eg demisting windscreen).
Just pulling the side out and putting your hand up finding the cap and then replacing it will work for a while.
Can be done if you have thin hands, don't mind working blind, and get your hand trapped a few times!!
I took my caps off and replaced with ducting to allow the air flow to the foot well.
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