This is common , the roof fabric don't like cold temps so all you need to do to test if it's just that problem is close the roof put the car heaters on full cover the roof with a cover to help heat the roof up faster, then give it a go again,,, you can also uses some clear grease on the roofs frame , this should sort it out ,,,
Hope it helps and what ever you do don't take it nissan they will say the hole roof has to be changed they are STUPED !!!
And forgot to say if it's not being used for a long time the fabric/ vinyl gets tuff this happened to me when I got my car
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