Seemingly Random Electrical Issues?

Are you getting my messages? I've sent a couple and now I don't see them in the thread

My car has two ON key positions not including the OFF position. I will note whether each wire is receiving power at each position.

White:

This wire is receiving power when the key is OFF. It only receives power when the key is in the ignition and in the OFF position. It is not receiving power when the key is in either ON position.

Brown:

This wire is not receiving power when the key is in the OFF position. It is receiving power when the key is in either the first or second ON positions.

Pink:

This wire is not receiving power when the key is in the OFF position. It is not receiving power when the key is in the first ON position. It is only receiving power when the key is in the second ON position.

I ran this test initially when my car was malfunction and unable to start. I now ran the test again when my car is able to start, and I got the same results. What are your thoughts on the results?

I understand the diagram to say the following:

Brown should receive power only when the key is in the ACC and RUN positions.

For my car, brown receives power in these two positions but also when the key is in the START position.

Pink should receive power only when the key is in the RUN and START positions. This is accurate to my vehicle.

White should receive power when the key is in the OFF, RUN, and START positions.

For my car, white only receives power when the key is in the OFF position.

Could you confirm whether I am reading the diagram correctly?

Okay, I’ll look into getting that replaced. Do I need to replace the whole cylinder or is the linked part sufficient to replace?

https://www.walmart.com/ip/Ignition-Switch-Compatible-with-2006-2011-Buick-Lucerne-2007-2008-2009-2010/1953954588

That didn’t solve the problem either. I noticed the issue is triggered most commonly when I start the car when the engine is already hot. This sort of intermittent electrical issue reminds me of a faulty ground I had on another car. Do you think the problem could be a loose ground?

Yes, the car works properly now almost always, but the problem still occurs sometimes when I start the car when the engine is already hot. Is it possible this is a grounding issue? I can check the grounds, but I’m not sure if that’s a possibility.