MUSIC STOPS PLAYING

Hey everyone.
I need to know if anyone has come across this issue. I play music from my phone. Music I've downloaded. I download music mixes from YouTube that can go from 15 minutes to an hour. When i select songs that are average length 2 to 5 minutes it plays through, but when I select a larger music file it stops almost midway. I can jack my phone to my marantz and it plays through. It's only through HEOS that it won't.