Recently, with the new update got some new problems.
First is when you tab out, it seems to 'pause the game' by doing this, it doesn't show you the count down timer going, any notifications that you used to get, the sound that alerts you to the villain or a quest/task is done. Before you could let the game run in the background, on another screen, and you could see how much time is left on a quest or hear a sound when it notifies you.
Second because of the pause, it tries to catch up on everything that has happened and about 1/5th of the time, it causes the game to crash. This is to say the least, very annoying.