iPV or Sun Tracker app quits unexpectedly

Users of iOS 4 and later are experiencing performance issues with the SunTracker or iPV version 2.3 and 2.4 quitting or returning them to the home screen unexpectedly. This affects users of the iPhone 3G, 3GS, and 4, and the iPod Touch. This issue can often be resolved by deleting and reloading the app by syncing it with iTunes. If you did not sync the app with iTunes prior to deleting it you can retrieve it from the iTunes app store.  If you use the same Apple ID as when the app was purchased you will not be charged again when you click “Buy”. Other intermittent crashes can be cleared by resetting the device:  http://support.apple.com/kb/ht1430