2011 Peugeot 5008 radio failure

Car radio intermittent power, display screen works fine and the buttons on radio unit control display no problems but the radio does not turn on, don’t connect to Bluetooth and knocks out reverse sensors although that does show on the display. I have changed both fuses (on radio unit and main fuse box) pressing power button does not do anything when the radio is not on but on the occasions the radio is on the button works fine.