Hi. I use ipad3 and use it only for internet and reading books. Yesterday i downloaded app from appstore and received email from apple.,, Your Apple ID, xxxxx@ xxx.com, was just used to download Xxxxxx from the App Store on a computer or device that had not previously been associated with that Apple ID.
If you initiated this download, you can disregard this email. It was only sent to alert you in case you did not initiate the download yourself.
If you did not initiate this download, we recommend that you go to iforgot.apple.com to change your password, then see Apple ID: Tips for protecting the security of your account for further assistance.
But I used my same ipad and nobody else use it. Now I do not have any problems. Just yesterday before it happened my ipad was suddenly disconnected from wifi and I was forced to connect it manually again. That is all.