This is a HTC Desire 626s, service is with Boost Mobile. Normly the volume controls on the right side control the ringtones & notifications. Not anymore. Now the volume controls on the right side control the music & videos. in order to change the ringtone & notifications volume I have to go into the settings > sounds & notifications > volume to change the ringtone volume down to buzz at night and meetings. I don't know how it happened or how to correct it.
Steve
Steve