Watch beeps at midnight ever day?

Have recently purchased a Vivo active 5. Every night at midnight hour it starts beeping? There are no alarms, timers set. Nothing in my calendar ? Have reset the watch, updated the software. Checked through the connect app. Disconnected network settings, Bluetooth etc. But still it wakes me up every night with it's beeping for five or more seconds. 

I'm ready to return it, this is my last attempt to get help.