My vibration stopped working only when it came to Samsung Members Diagnostics check. But it seems to have fixed itself. Give it time it might fix itself.
I'll try and help with this vibration is used in many ways not just to mute calls you could have your lhone on vibrate and turn on other setting that use vibration to cause actions your keyboard your typing everything your phone uses can be reversed in some shape or form if you have devices linked one device could pick up on your setting and in turn cause your phone to be silent also make sure you don't have do not disturb on.
