Hi, I had the same problem once. I also tried a lot (as reboots, clearing cache…) but finally came only out of that via the following workaround:
Settings->Sound & notification->Do not disturb->Automatic rules->Add rule
Added a temporary rule there so that this rule just enabled and then DISABLED “do not disturb” mode (via setting “end time” to very soon). This way “do not disturb” finally was disabled again for me.
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