Ok I have a Kenwood 8101D running 2 Audiobahn AW1251Ts and for the most part my bass is nice and loud and a consistent volume... but sometimes, at least twice every time I drive the bass volume drops down and I can barely hear it, then it goes back to normal again. They worked fine before I had to take them all out of my car. All I can think of is a bad ground? I checked all the speaker connections and they're all good so that's all I have left, could that be the culprit? The amp is less than a month old as are the subs btw.