Welcome to my world.:jump:
My radio started doing this about 6 months after I bought my 4runner brand new. Its a 2008 and has done it every summer for the past 2 years. Every time it gets hot out it starts. Whats better is that I get the big blocks, gibberish, it will turn off on its own, if I have CD's in the player it will randomly at will start ejecting them and sometimes the volume knob does not work, it just spins around and around.
Since mine is / was under warranty I talked with the dealer and they confirm there was a lot of bad radios and this was a know defect. If the vehicle is under warranty they will replace it if the number on the radio falls in the recall lot. I decided I would rather upgrade to an aftermarket radio down the line and opted out. Plus I would never let a dealer pull my interior apart. The will F it up. You’re better off going after market.
btw: when any of this happens to me, I simply turning off the ignition and restarting the car to reset it.