2004 L322 Td6 RR Vogue - Air Suspension/Instrument Panel

I have an intermittant Air Suspension/Instrument Panel problem. When I start the RR, sometimes the Air Suspension/Instrument Panel work fine and all the led's come on and the Air Suspension works. Other times I get the Air Suspension inactive error message and the Instrument Panel switches and leds are dead. Even when driving, these can go off, or come back on! It does sound like an 'iffy' connection. Has anyone had this problem and solved it?

Cheers

Gary