If it's wiggling around then it's possible that something physical is loose inside. If it is then you may just be playing luck of the draw until it breaks.
You can take it into your local apple store and have them check it out although all they may do is offer you an out of warranty replacement. Or since your warranty is up you can look for a local repair place and see if they can help you. THe downside of that, you will surrender your ability for an out of warranty replacement if a non-authorized repair place touches it. (then again, the out of warranty is the same model and if my iPad 2 were to break I would probably choose to put the 249 dollars towards a newer model than replacing a 3 year old one)
YOu may want to keep it synced regularly, just in case you do end up losing your ability to charge and sync you don't lose all your data.