So I recently upgraded to 4.3 stock rom, rooted and I don't think I have Knox. Anyways everything works fine with the exception of phone calls. Whenever someone calls me and I pickup, it takes about 10 seconds before the speaker/mic turn on. There is also a delay in the speak/mic when I place calls. Any ideas on what happened? This is actually the second time I've upgraded to 4.3 and the last time I went back to 4.1.2 it fixed the same issue. I'm running version L710VPUCMK3