User recently reported to me that she can only hear the sound in my app (created with Construct2) using headphones and without headphones the sound simply stops. She was using iPad.
After she used the app (link to the app: http://crystalgames.space/luciddream/ ) in Chrome as a webpage (not web app) everything was fine again.
I can confirm this with my Android Xperia Z3 compact.
When I was using this app as web app in my homescreen the sound stopped after few minutes and not triggered the voice cues after the timer ended. After the sound went off, everything went silent, even if pressed again, except the music which was streamed from the server.
When I switched back to the browser (not web app), everything worked as it should.
So are those browser limitations or Construct2's bugs?