CJP

I was driving last night and noticed my headlights would fade out for a second or so when I hit the brakes. It did this a few times. All of my interior lights on the dash blinked for a second too like they were going to go out. Earlier that day, my CD player also cut out while playing a CD. The car seems fine now. Could this be a alternator belt problem? I had them replaced a couple of months ago and was hearing a squeek at startup for a long time.