Ac, radio and turn signs go on and off

I have something weird going on with my car. One of the days, the right and left turn signals did not show on the dash board as I was driving. I stopped and checked, and the actual lights on the car were blinking. Next, the radio started to display “disabled” and the AC stopped blowing the cold air.

The following morning, as I started the car, it was fine. I took the car to the dealership and they said there was nothing wrong with it (yet, they charged me for the diagnostics).

The car was fine for a while, and now it started to do it again, but it comes and goes. I think it does it when it is hot, but this could be a co-incidence.

I took the car to a mechanic (not a dealership), he was not able to tell what’s wrong. Any ideas as far as what this could be?