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YMMV, but I had this happen a couple of years ago after storing it for the winter in my unheated garage on a bare concrete floor. After I had done a bunch of reading, I suspect the cause is moisture. I didn't do anything about it over the following summer, but noticed that it *very slowly* got smaller and smaller. Eventually it disappeared completely. I've put a tarp over the concrete floor every subsequent winter before storage, and I haven't had any issues since.
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