2008 Silverado Door Speakers Quit Working

I have a 2008 chevy 1500 with radio speaker problems.
2008 silverado door speakers quit working. Those kenwood speakers can be had off amazon for under 30 pair and if you buy something else to bring the total to 35 or more you can get them shipped free. They work off the front door speakers. The drivers door speaker was the first speaker to quit working about 1 year ago. The 2008 chevrolet silverado has 5 problems reported for speakers stopped working.
Front door speaker not working on 2008 dec 08 2013 4 12pm innoi. I have a 2008 silverado and noticed my chime was not working. At work we also have a 2008 silverado as a pool vehicle and all of the door speakers quit working in it and only the tweeter speakers. I am having an issue with my 07 gmc 3500 duramax first od all the door ding and seatbelt dig has stopped working and my front factory speakers that are mounted in the doors are also not working.
They are on for a day or two then back off for weeks. Average repair cost is 1 000 at 50 150 miles. Front speakers in my 2008 silverado dont work all the time. When they are off there is no sound from the directional sygnal or the fasten seat belt light.
Last week the 2 speakers on the passenger side quit. Bought a new pair of kenwood speakers from crutchfield and installed them last week. Is there a switch that controls the speakers when the seat belt light is on. One of the door speakers quit working in my 2007 silverado.