I Google the issue before hand, but close to it did not come. My game freezes upon 8:59, which is the time a child Sim of the househd is off to boarding school. I tried resetting all the lots (being fire station, rabbit holes, one occupied and unoccupied home lots), apart the active residential lot (else my kid will no longer be enrolled), and the members of the household except the mother and child.

So any idea what could be the cause + how do I resolve it?