need help with factory amp keeps blowing

[jsmith01]

In my wife 01 Yukon the factory amp keeps blowing I have put in about 5 of them I have got used one's & reman one's they all last about 3-4 months. It's a non bose setup I do have a pioneer radio in it. Any help I'm going to go to best buy and get a 4 channel amp bypass all the factory stuff today if I cant fix the factory stuff