Mine does that all the time. It's never been wet (stick on inside is white still as well) but it'll usually be like that for a couple hours, then its fine for weeks! I still have no idea but every time I've tried to head to the store with it, it "magically" stops doing it by the time I get there so I've just dealt with it. I always notice it after I've been moving things around/lifting stuff up so I have a feeling my issue is triggered by the keyboard being smashed around in my pocket.
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