I have a rockford fosgate 300 watt 4 channel amp running to 4 rockford fosgate speakers (2 front, 2 rear) 6.5 inch in front. Once in a while when running at highway speeds it loses sound for a few seconds. Is the amp overheating? Also should the amp be set to at optimal performance with the automatic sound control of the HK headunit disabled or at level 0? Thanks!!!