Earlier this year, my car radio suddenly stopped working. When I first started the car, it would work for a couple of minutes and then go silent. The lights on the faceplate continued to light up, but absolutely no sound. Once it went off, I couldn’t get it to work again unless the car had been turned off for some time (at least 5 or 6 hours). It eventually (within a month) got to where it would not produce sound at all. I think I replaced my car battery about this time, but I don’t remember for sure - I could be confusing it with my mom’s car, which did get a battery this summer.
Then earlier this week, my car suddenly died and the mechanic replaced my battery and alternator. The radio worked for two days afterwards, but now has started going silent after less than a minute.
I had hoped the battery/alternator had been the problem, but it appears that is not so. What could be wrong with it?