I have a Alpine MRV-F345 amp that runs my polk momo door speakers and recently it has started to shut off after about 10 minutes of playing. i dont think it is over heating because it would say that on the lcd screen it is just turning off. And i have an Alpine MRD-M605 right next to it running my sub and it has never shut off. could you please help me with finding a fix. I have 8 gauge wire running to the 4 channel and 4 gauge running to the mono. would the smaller wire have something to do with it.