To add to this, check the App Store for application updates. There may be updates deployed for the applications that are causing the crashes.My advice is before updating your device software, make sure to have read people's reviews on it before doing so because it's the only way to be sure it's going to be very effective and functional for your device.
Since you are having lots of crashing problems, I would strongly recommend that you downgrade the software and use the previous version which you had before.