Hello,
I am new to the forum, I have a 2003 BMW X5 4.4i when I purchased the vehicle the factory amp was not working properly it was playing loud static and distortion through the speakers. I purchased a replacement amp from a junk yard with the same serial/part number and everything seems to work fine but after about 30 seconds the sound cuts off, what do i need to do to fix this issue?

Thanks
Ed