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I've not heard of it myself either Steve.
I wonder if its worth taking the unit out of the dash and seeing if you can get it apart to see if there is fluff and dust inside the radio which may be causing the overheat.
I know thats what happens with computers.
But make sure you have the code for the radio before removing it.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo