2008 V50 2.0D won't switch off!

[chrisdc]

Lots of 'car won't start' threads but anyone ever have a situation where you turn the ignition off and the car keeps running?

Drove 100km to drop off a repair. Car turned off fine. Went to tailgate to unload...wouldn't unlock. No response from keyfob. The drivers side unlock button wouldn't unlock anything either. Put the key back in the ignition, car totally dead, no lights at all. Popped the bonnet, before I could touch anything the customer, who was standing on the driver's side, said he heard a sound from inside the car and noticed all the dash lights were on again. Car started normally after that. Tried to turn it off a few minutes later and it continued to idle, dash lights remained on. It's never done that before...ever!

Put the key back in the start position and drove to my sister's house. Warned her if I turned it off, it might not turn off and / or might not start again. Decided to park it where it didn't obstruct anything and could be easily loaded onto a flatbed if necessary. We chatted for about 15 minutes with the car idling. It then turned off fine and several hours later I drove it the 100 odd km back home again. Been too scared to drive it since as frankly, I can't afford the cost of a flatbed trip home. . Anyone have any ideas?

Perhaps I should add that approx 5 years ago, for a period of a few weeks, it would not release the ignition key. I drove it like that just covering the dash with a cloth to hide the key. Did some reading on forums of course and did partly strip the dash. One day the key just released. I spayed some Q20 into the receptacle immediately after that and it's been fine ever since.