i just bought two 10'' kicker Comp-VR and the same day i bought them the first sub in the series just froze up.. i smelt burning and after about a few hours of breaking them in both subs shut down, so i assumed the amp went into protect mode so i shut everything down and let it cool.. after about an hour or so i started it back up and only one came back to life but the first feels like it locked up.. what are the typical reasons for this?