Sounds like a sticky ignition switch. Periodically, I spray down my
ignition switches with WD-40 (all 4 vehicles, 3 makes) to flush out any
skunge and keep them loose. It is a sloppy and potentially smelly job,
but I do it with the windows open and an absorbent rag wrapped around
everything. WD-40 evaborates 100% over a short period of time and does
keep things moving smoothly. Plan to do this when you do not need to
drive the vehicle for an hour or so to let the most flammable fractions
evaporate. WD-40 is just thin kerosene after all. A small amount of
lock lubricant afterwards is important to maintain the slip.

With the Saab, I use only a very small amount of lock lubricant as it
is vertical, fully enclosed and in the center console. But NOTHING
containing graphite or extremely volatile liquids.

Peter Wieck
Wyncote, PA