Park Pilot issue - Help please.

I have a VRS which I bought 2nd hand 11 months ago.

Park pilot is set to auto and has worked great .

Suddenly yesterday Pulled upto lights stopped - n neutral car get close behind park pilot kicks in shouting and showing the screen and the P switch on the console lights up. I drive away BUT the screen stays on P Pilot and doesn't cancel. Used the switch to cancel it. 

Got home reversed PP comes on and again doesn't cancel when I disengage gear or even move off in 1st. Had to cancel again using the lit P btton.

Have tried turning off auto PP on the menu - but still get an issue of it coming on and not cancelling.

Any one out there had this or know what may cause this behaviour please?

Thanks