Two weeks ago the speakers on my Samsung Galaxy S4 stopped working. I couldn't hear music or callers and they couldn't hear me which was evidence that my mic was also not functioning properly. I sent it in the Samsung where they replaced the speakers and the mic. I got it back yesterday and I am still experiencing the same issues. I took the Sim card out and inserted it again. Then everything worked properly...for a while and then the problems came back. Suggestions?