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Hi there,
I can confirm this problem. It happens to me too sometimes and I can 100% reproduce this with the Google Sky Map app. After using this app, the display won't turn anymore, so I think it's maybe a software problem and not a hardware failure.
Cheers,
JoergK.
Strange, I haven't experienced it using Google Sky (I've only opened it about 6 times after the latest update). It happens to me just from looking at photos in landscape mode. Thanks for your replies guys. Let's hope Google fixes it in the next update.