Calculator screen is frozen. won't do anything

The screen freezes on the blinking square, the normal look of a calculator just turned on, but the only button that works is the on button, so to turn off the frozen calculator, one must remove the batteries. I'm using AAA rechargable 1.2V batteies, and I have a standard TI-84 bought 2 years ago. Now and then it unfreezes ofr about 5 secs or less. The whole thing froze randomly once, then again about a week later, then 2 days after that, then more and more frequently, untill there is just seconds of use between each frozen stage. The screen freezes on the blinking square, the normal look of a calculator just turned on, but the only button that works is the on button, so to turn off the frozen calculator, one must remove the batteries. I'm using AAA rechargable 1.2V batteies, and I have a standard TI-84 bought 2 years ago. Now and then it unfreezes ofr about 5 secs or less. The whole thing froze randomly once, then again about a week later, then 2 days after that, then more and more frequently, untill there is just seconds of use between each frozen stage.

mine too mine too