One of the beta testers experienced the 'freeze' condition on her Tungsten E (and I had it on my T5), but we were able to use the power button to just turn the device off and back on. Your situation appears to be a little different, and Arthur will probably want more information from you.

In the meantime (I know this is kind of drastic, but there's a possibility it could help), you might try uninstalling from the Palm OS "delete" function and reinstalling the game. Do you use any third party launchers, by any chance?