this is most annoying I have kissed very important phone call last night rom hospital because I phone keeps putting its self into silent mode pmease someone sort this out
@Suz20: It sounds like Do Not Disturb Mode may be active. To check this, please go to Settings > Notifications > Do Not Disturb, and toggle the switch next to it so it moves to the left and greys out. I hope this helps.
I've had similar problem with S7 and A53. Others report same problems. My issue seems to be happening after a phone call I answered. Next call I don't know about because it went to silent for ringer volume. And NO it is not the Do Not Disturb setting. I can't predict when the issue will happen.