I see some topic with people getting unspecified errors in the first few seconds of battle, and I have had a couple of those, but sometimes it lets me play for a few minutes. At a random point in the battle, it will minimize the game, make the game window transparent (the window is still on the screen, the outline anyway), music continues to play, but I can't get back into the game. I have to force it down and re-open it.

Any ideas?