I agree it sounds like a bad connection internal to the ignition switch. After checking the wiring per the FSM, if it all checks out OK, I would just go buy a new ignition switch to install or just keep handy for the inevitable.
BTW, if you're in the habit of hanging a bunch of extra keys & stuff on your key ring it can shorten the useful life of most ignition switches. The extra hanging weight combined with the shock & vibration from driving tend to wear them out faster.
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