Sounds like your droping the ohms to low, this amp can only handle 4 ohms in bridge mode and can handle 2 ohms in stereo mode. Need to know when fuse blows, when you turn up volume or as soon as you turn on system. I recomend to just check the ohms of your speakers, thats probably the problem. Keep it at 4 ohms when you bridge it and you'll be fine.