One recurring problem we have in projects is the fact that the stake holders only start looking properly into the delivered software until the near the final release date even though we deploy the sprint result into the test environment every time and demo from it and keep reminding them that it's really important to get their feedback during the execution of the project and not only when the release end approaches.
Even with all this, we usually get only a couple of issues reported every sprint and 10 times more issues reported when the release is about to finish.
Any ideas on how we could motivate our stake holders to get more involved in testing during the whole project and not just when the deadline approaches?