This happened to me. When I still owned my '02 Tacoma TRD, I carried a lot of keys. I did a lot of rock crawling and those keys would be swinging and slapping the dash and steering column. By the time the truck had about 100k miles, the ignition key could be removed with the truck running. After that I got one of those key rings with an air chuck style disconnect in which I could remove the other keys from the keys for the truck and camper shell and keep them in my pocket. My grandson got that truck when I bought my '18 T4R and the original ignition switch still works fine, but the key can often pop out and fall to the floor off road.