When I first started using the app, I would turn it off every time I turned off the car, but I had problems with my points updating.
Through trial and error I have found that the only way to get my points to update reliably, is to leave my client on, whether I'm driving or not.
Typically, just before midnight the data upload will occur, and then I can quit the app without consequences.
Problem is, leaving the Waze app running seems to wear on the battery life of my Samsung Galaxy S3.
What do you do? Have you also found that leaving the app running all the time is required?
Samsung Galaxy S3 - Verizon
I had 3 iPhones in a row. (original > 3G > 4)