2015 Prius Persona Audio cuts in and out

My 2015 Prius Persona is having Audio issues of Cutting in and out, and for most part is Out, I have had sound come on turning a corner, I have had what seemed like a short in the USB, all went out the door of ideas when while talking to someone about this issue and my car was sitting idle, and with no movement in car Audio just blasted on to speakers only to go out again within 2min. Is this a ground Issue or a speaker wire issue
and everything else works on the radio, navigation,etc. I can even still use steering wheel buttons to advance to next song on my Iphone via bluetooth connection in car, shows artist and song playing on the face of touchscreen