Many have reported erratic behavior from various electrical systems throughout the car when the ignition switch goes bad. Apparently it does a lot more than start the car. Its only $15-40 depending on where you buy it and is a simple DIY fix. You may want to start there, and if that doesn't fix it, at least you can rule it out now, and you'll have a new ignition switch that may head off other potential problems.
Is there excessive play when your key is inserted in the ignition? Is it sometimes stubburn to trun? It may be worth a shot. I'm sure others will chime in too.
Good luck and report back.
Jeff
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