I have changed the ignition switch 3 times. and wiring also.
the problem is this issue does not happened always.
every time we changed the parts or do something, we have to test it for 1 or 2 days.
any way, we are going to work on the wiring system. if I found the problem, will inform you.
Has the car got a aftermarket stereo or any other modifications? if so, I would start there, was in ATS (tyre shop) today, chap said he was having problems with an Astra not turning its lights off after fitting an after market stereo. Can do funny things with the canbus systems?