Sometimes its because of faulty connections. Check your bluetooth settings. Maybe it couldn't connect to the other device. Try rebooting also. Sorry I'm no expert but this happened to me once so this is all I can advice you.
Sent from my rooted Samsung Galaxy Core GT-18262 using XDA Premium 4 Mobile Application.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer? | Terms of Service