I have Galaxy Note 8 & had the same issue after last update. I combined a couple things I read online & figured it out. Restart your phone in SAFE MODE. Go to the CLOCK APP & open it. Click the top right of the & it will say uninstall update. I uninstalled the last update & my clock works like before. It goes off if my phone is mute or on vibrate just like before. FYI you might lose your alarms you had set up previously so you have to set them up again. It was worth it though because it caused me to be late for work twice. Hope this helps.
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