call them first thing in the morning and get an RA#,you'll more than likely get it handled faster than waiting for someone from XS to see this. My 3400 made a hissing noise one night after I had been driving,I'm starting to wonder if there's a problem with the D3400's and heat. I have a battery wrap on mine to keep the heat down but it was on it when the battery was hissing so IDK.. I try to check mine often because of that,my D1200 in the back has had no problems though. Nice setup btw.. I'm wondering how much space between and how you mounted those amps but I'll see it in your BL.