I have diagnose several car stalling problems, in several cars, as “too much stuff on your keychain”.
I learned this from my own issue: A 1987 Honda I had that would stall out when I shifted. I had a kubaton on my keychain. My leg hit the kubaton, and it turned the key back.
Guilty!
I’ve warned several people about the same thing ,, a heavy keychain will wear out the ignition lock cylinder pretty fast..