I have an HTC One from Sprint, why are text messages sometimes hard to hear?

[AC Question]

I have an HTC One from Sprint

When I receive a text, sometimes it is a muffled different tone that can be hard to hear. Other times, I get a full volume text notification. Is there a setting or update that can correct this?

 

[B. Diddy]

Re: I have an HTC One from Sprint

Welcome to Android Central! Are you using the stock Messaging app, or something else like Hangouts? Do any other sounds get muffled?