How can I get my phone to stop randomly switching my phone to mute with no ringtone for incoming calls. This has been occuring ever since the last update. When it mutes the ringtone if I go into the Sounds and Vibrations option under Setting and select volume, the Ringtone volume icon has a slash thru it and will not allow me to increase the volume. If I reboot my phone it will then reset and allow me to increase the volume on the ringtone but after about 6 hours it goes back into mute mode.
Thanks