Your Apps could be crashing for multiple reasons.
Try to delete some internal memory in the device to make it easier for the app to run more efficiently.The more internal space the app has to run the less issues the app will have when in use.
If that doesn't work, try to delete some internal memory in the device to make it easier for the app to run more efficiently.The more internal space the app has to run the less issues the app will have when in use.