I'm sure I read somewhere, recently, that the soft-top should be left up and in tension if the car is unused for a while, the reasoning being that the material can shrink (new one on me).
If the material has shrunk, even slightly, and the soft-top is put in tension again either the material will return immediately to its pre-shrunk size (unlikely) or the additional tension will be transferred to the windscreen pillars (far more likely, at least for a time).
That, for my money, is the most likely route to a cracked windscreen. So I will always leave the roof in tension whenever the Mog is not being used.
