Shorten time to roll dice
A player who leaves without stopping causes three long long waits before the AI takes over. I suggest to give one quarter of normal clocktime to role the dice. If the player does not throw the dice the computer roles the dice and ends the turn, after three times AI takes over completely. When a player rolls the dice within time he then gets the full clocktime.
This is not possible, because cards can be applied before rolling, so the player might need the time to think before rolling