Zune screens cracking from battery pressure?

Interesting news on the Zune front: a friendly tipster's buddy works at a Microsoft call center and handles Zune-related issues. Apparently they've received numerous reports of the Zune screen cracking for no apparent reason, after being left charging overnight. Our tipster's friend conjectures that the lithium ion battery -- which resides right behind the top half of the Zune's screen -- is expanding from overheating and putting too much pressure on the screen, causing it to crack. Unfortunately, Microsoft currently regards the issue as outside warranty coverage, leaving the victims with a broken Zune and nowhere to turn. Of course, this could all be off the mark, and it might turn out that a few Zune-droppers conveniently made up the same story to try and get a free repair, but if there is such a battery-expanding problem, we'd sure like to hear about it -- any of y'alls experiencing screen crackage of a similar nature?