Android Auto/Chevy MyLink issue

I am having a strange issue with AA (I believe) When I start AA, it works perfectly. Once I plug the phone into USB, it pops up on the screen like it's supposed to. Music and phone calls are no problem. When I start either Maps or Waze, the GPS signal cuts out as soon as the phone screen goes blank. If I press the button on the phone the GPS picks up a signal almost instantly. Is there a way to keep the phone's screen from going into "sleep" mode? Or is it an issue with the radio?

Galaxy s7...

Android Auto/Chevy MyLink issue

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