I have a Range Rover Sport TDV6 2008. I have just completed a 1800mile trip to Austria from the UK no problems. Went to fill car with fuel this morning, when i took the key out of the ignition. The hazard lights flashed, fan switches on and off, all the door lock and unlock. Parking break fault, engine fault light appears, warning light comes on. After about 30 seconds I put the ignition key back in and turn the engine on all problems go. I have ended up disconnecting the positive terminal from the battery, so the battery does not go flat. The following morning reconnected the battery, the cat works as normal. I drove 150miles got to my destination. Same issues appeared again.