Radio comes on at random times when parked and key is removed

What is your question?

Had truck at dealer and they replaced the ignition switch and the drivers door lock thinking this was triggering it to come on randomly but it still happens. Dealer has had it now for 2 weeks with nothing happening. The truck is behaving itself. Dealer supplied me with loaner so they have been great but they are stumped. Can someone help. Thanks Corky