Personally, I would go to a dealer.

Are all the items that act up related to the ignition switch? For example - parking lamps or 4 way flashers are not. If when the problem happens, wiggle the key or turn it back to the accessory position.

Does your car have an old-fashioned key? Does anyone who drives the car have a bunch of junk on their key ring? Damaging expensive ignition switches with heavy key chains was a thing about 15 years ago.

My wife had a heavy key chain and if she braked hard, the swinging keys would shut her VW 411 off!!!!

Do a search for faulty ignition switch on this board or on the web..

The electrical part of a key switch is not hard to replace - perhaps taking it out and looking at it might be worth the time,

Multiple and intermittent electrical issues related to wiring are not common. These type of issues point to the ignition switch or primary wiring like battery cables,

If there is a an auxiliary, small wire on the positive battery cable, look for corrosion and give it a good pull - it might break away! This happened to ou '90 744 TI - the wire was so corroded, it just came apart