to GameBoomers.
Are you playing the CD version of the game or are you playing it as a digital download?
There's a thread
here on GOG about freezing problems while playing Dragonsphere, with one or more possible solutions mentioned.
Otherwise, let's wait for the techies to help you out here. If you still need a saved game after that, you can ask for a saved game over in the Adventure Game Hints & Help forum.