Hello... I just started having this issue in 7.1, but it started a few days after updating. I have sounds to on and maxed. However, when I receive a text, it won't give me the text messages sound. I tested and the sound plays when I'm in the phone, but if the screen is locked, the message will just display. There won't be a sound and the screen won't light up at all. I've restarted multiple times, closed apps, but nothing. Anyone else have this issue? Edit: this also happens to Mail and other alerts. Essentially, I'm not getting any sound alerts when the phone is locked.