Audio drops from videos when playing USB 3.0 iXpand drive on iPhone 7 and on iPad Air 2

I don’t think this is the same issue i was having. I could see the progress bar still moving and the video on the screen would be  changeing.  I just couldn’t hear it. So for me the audio was cutting out. I think we are having different issues. 

Maybe your suggestion of re-coding the vidoes would solve the issue. Any advice or suggestinos on how to accomplish this?