I have a Zire 71, and while I had a few odd bugs early on, the only time I noticed freezing and spontaneous resets was when I had Village Sim Toolkit and Village Sim Editor (Johnathan Wu) installed. I found these apps intriguing, but decided I just wanted to play the game, so I removed them, making sure to root out any orphan files.
Since then, no unusual problems. I did run afoul of the "don't touch a villager during burial" bug, but other than that, I have played two complete games with no problems. I do try to remember to exit to the App screen before shutting down, but even when I forget and turn off/time out the Palm with VS running, it doesn't cause a problem.
This is a long shot, and assumes that others with this problem have VSEdit or VSToolkit installed, but it may be that THESE are the apps that have issues with Zire 71 or Tungsten T2.