Crashes / blue screen of death – NAVIGON U.S. East Review

Navigon has been crashing my entire iphone first to a blue screen and then the apple logo/restart. Pretty jarring. Tried deleting and reinstalling app to no avail. No customer support through app which is why I'm leaving the poor review. I'd hold off on spending $50 for a GPS app that no longer works. The app performed well for about a year before failing about two weeks ago. I'm running ios7 on a 5s and have heard about difficulties running Navigon on ios9.
Review by Brendan the deer on NAVIGON U.S. East.