I don't listen to FM radio all that much but I do play music from my USB key and have issues with the car remembering what was playing before for the last year or two. I am also currently on 2024.3.25.
So, your radio works until you turn off the car (for some undefined amount of time) and then when you re-enter your car, the radio is not playing and cannot be accessed by normal methods. By that I mean if you either press the 3 dot icon and select Radio or use the voice command "Media radio", the radio does not play and that you need to re-boot???
And after you re-boot, does the radio automatically start playing or do you do something that turns it on?
I don't have any immediate recommendations to this problem. I would normally say to re-boot the car to solve unusual issues but since you have to do this every time you want the FM radio to play, that's not the fix.