Toyota Corolla S stereo not working

I have a 2014 Toyota Corolla S. First, the navigation was not working properly, you could not hear the lady talking. I was told at the dealer that my speakers were not working in the doors which is the speakers that the navigation uses....they are covered under extended warranty however, they do not cover the wiring etc which is $167.00. Then, the next week my whole stereo stopped working, it went to an update and just kept doing the same thing over and over, like it is stuck.....anyone with any suggestions or ideas?