Facebook mesenger ringing

[Aboamgd]

After i update to lolipop 5 some apps doesnt work correctly like facebook mesenger when some one call me the phone ring once then go silent even all settings are ok

[Qatrium]

Try clearing cache:

- Go to Settings -> Apps -> Smart Connect -> Force stop, Clear cache, and restart your phone.

[Phy]

You can try to uninstall Facebook and the Facebook messager, restart the phone, then re-install them and check again.