My father-in-law has an original iPad and is having trouble with apps crashing. He lives 6 hours away and is not at all tech savvy so it's difficult to troubleshoot over the phone and email. So far, though, I've had him do a restor through iTunes and that didn't seem to work so I'm unsure what to do next. Any ideas? It seems to be all apps, not just a specific app.
Have him sign out of the App Store in settings, then sign in again, then purchase a free app.
This resets the digital certificate that tells the device it can run apps for that account. Often these certs expire if you don't download anything for a year or more and renewing them happens when you request a new app.
When this is done, also check on iCloud backups and enable them if you can. An ounce of prevention, etc....