Faltering sounds like a problem or incompatibility with the phone (power, specs, or OS version). You using Android or i-phone? Or (in fairness) maybe there was a glitch during the download/install. You might try deleting/removing the app and re-downloading & installing from Google Play or i-store. You might even get an updated version of the app in the process (if there was an update available).
I just discovered that I only hear the faltering sounds without headphone. I do not hear the faltering sounds if i use a headphone. I use Android. I already have reinstalled the app.