The links below go to Apple's support documentation for general problem solving. A simple power off, reset, or re-install can solve many issues.
Reset the iPhone by holding the sleep/wake button at the top right of the device and the home button at the bottom center of the face at the same time. Hold them both until you see the screen go black and the white Apple logo appear. When this happens, you can let go - the iPhone is rebooting.
Resetting the iPhone should not remove or delete any data or settings.
Shutting down and relaunching an app can sometimes help solve certain problems. To shut-down and app that is running in the background follow these steps:
If your app is crashing, we would like to find out why. To do so, we will need certain information from you. After the app crashes, it creates a crash report on your device. To send us your crash report, take the following steps:
The log file names start with application name and have the extension crash. The logs themselves are just text files, so you can open them in your text editor and cut and paste, or (preferably) attach them to an email. Which brings us to the next step.