If you've not read through this thread then you could try...
1.Unplug the power chord for a hour then reconnect and try again.
2.Go into safe mode and rebuild database.
3.Save all your game saves to the cloud or sub and initialise the system from safe mode.
4.Await a fix for the patch that was meant to stabilize the system that in fact de-stabized lots of systems.
5.Good luck.