my ipad 1 keeps shutting down apps
My ipad 1 keeps shutting down the apps. I have closed all the apps using the home screen click twice and holding apps until the minus sign appears. I have reset the ipad using the home and sleep button. I reset the ipad completely and started it as a new ipad. I added one app only and it crashed. When I go to settings/about/diagnostics&usage/diagnostics&usage data I see LowMemory-2013-05-29.plist. I am running verion 5.1.1. My capacity is 13.8GB. I have 10.8 GB available. Any suggestions as to what may be wrong?? Thank you in advance.
iPad, iOS 5.1.1