I bought Basslink II from an authorized online dealer, I had it professionally installed. The problem is that it only works for the first 3-5 seconds then stops working (even if it is powered up). It works for longer time only if the car is shut off and the head's volume is less than 50%. Otherwise if the car is running it works 3-5 seconds each time I have to shut the head off then on. I checked the connections, power, fuse. Installer said everything is installed properly. Cables are connected with both rear speakers, Installer said it is ok even though instructions say they should be connected to Front and Rear speakers of my PT Cruiser. Does it make a difference? What seems to be to source of the problem? Is it possible that the unit is defective? Please HELP!!