My first thought would be the ignition switch, the mechanical tumbler or the middle barrel assembly; I would scan the car for trouble codes and see what they are. Ignition switches are a pretty easy replacement and are not that expensive; you can remove the ignition switch and try to turn the switch with a screwdriver (also check to see if the plug/wires to the switch, are melted; which is a common problem). If the problems go away; then the barrel or tumbler are messed up. If the problem is still there, then I would try replacing the switch and see how it works with a new one.
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