I have been experiencing the same bug since the update too. It's always around midnight when time is sped up (auto or not). It is happening every night in game. The sim continues repeating the animation they were doing when the issue occurred, however objects such as trees continue to sway and the sun comes up and goes down again (as if a whole day has passed during the freeze). I cannot click on any objects, open the phone, etc. If I enter build mode while frozen and return to live mode, the game is still frozen. Eventually it unfreezes and the speed returns to normal everything starts moving again. If I have selected an item while frozen, sometimes the pie menu comes up. If I have opened the calendar or Notebook, they open when unfrozen.