radio cuts out every 15 mins

[ALMURRAY]

megane II 1.5 DCi 2006 model..

My radio seems to cut out around every 15 minutes.. I get an audible beep, the screen icons flash and it switches off.. if you turn it straight back on again everythings fine!! this one has me confused.. im suspecting an overheat issue as a possible but my electronics knowlege is limited.. only manual I have is for the 2002-2005 models so unsure if the wirings identical

Anyone came across this?

Al..