Why does Opera NOT rotate all the time? on 6.5 Sense 2.5

[THE-COPS]

Try calibrating the G Sensor. If you dropped your phone recently , that can knock it off balance sometimes. I have always had issues with Opera not rotating when it should. Sometimes you gotta shake your phone like a salt shaker to get it to rotate. It's an Opera issue, because if it hasn't rotated when I turned the phone around and I minimize out of Opera, the screen fixes itself right away on the home screen. I don't think it's a 6.5 issue. I have 6.1 and it gives me trouble. Then again, you have Opera 9.7. What build of Opera Mobile is it?