The past few times we have used Waze the routing was changed with little to no notice. I'm not talking about missing a turn and having to recalculate but, drive along an interstate for example and have it say X miles to go on the road and then a few minutes change to take the next exit in half a mile. Meanwhile you're in the left or center lane with no hope of getting over. It has created a situation where you have monitor the screen all the time because it does not give you notice of the route change. It just does it. Waze used to give a decision box when it needed to detour or change its routing.