Same thing over here, the New upgrade didnt help. It seems that the clock stops working, the one in the notification tray when you pull it down, while lockscreen clock and widget clock work fine, just so you think that everythings fine.
It just froze time to the day before and i didnt notice it, and alarm didnt go off making me late for work, cant say how frustrated i am right now, as i cant trust probably one of 3 most important things on my phone right now.