I got exactly the same problem. Anyone can help?
EDIT: Yay, I got it! You need to perform a System reset.
- Turn off wireless mode by pressing and holding the red Power/End key.
- Remove the battery cover.
- Press and hold the UP button on the front panel of your device.
- Take out the battery.
- Put the battery back in.
- If you see a progress bar (see below), keep holding the UP button.
- Next, the Palm Powered screen (see below) will appear. Release the UP button when you see it.
- Important: Perform a soft reset after confirming that the System Reset fixed your issue.