Stop automatically rerouting to Waze's preferred route
Your selected route should be "sticky" or require permission to change.
Waze is great, we all know that. But there is one issue that is almost service-breaking. When I select an alternate route, as opposed to waze's preferred route, if I make one minor change (such as backing out to the left when Waze expected me to go right), Waze will put me back on its preferred route.
This happens every time. More than once Waze has rerouted me onto the Interstate in rush hour even though I had explicitly chose a different route 10 seconds earlier. There is no voice prompt or notification that this happens, you only notice when you realize you're on a different path.