sounds like some of the gremlins usually associated w/ bad ignition switch. Couple of questions to help diagnose it...
Key tough to turn or pull out?
If you wiggle it when key is in do these symptoms subside or change?
Do you get key 'ding' even when removed?
Do you get the 'klunk' sound when pulling key out of ignition?
Does radio stay on (for longer than 20 sec when key removed)?
If so, it's a DIY r7R for ~ $30 if you buy part from dealer or < $10 if you buy online at autohousaz.com
link here to part
Might also check for water under driver seat.
Bottom line, I agree, doesn't seem like it's your alt...