I have a Realistic System 300 It was a gift from my grandmother after she passed. The last few days I've noticed that the speakers are cutting out. It's always one side or the other but never both at the same time. I checked the speaker fuses both were good but I replaced with new ones anyway just to be sure. I also pulled the back off the speaker boxes and checked the wires, there were no breaks anywhere. I am wondering if it might be a volume control short. Any advice/help would be greatly appreciated thanks.