Don't know whether this happened to others, but it is happening more and more often to me during the last week.

When opening the expandeable part of the tray (I have the brightness/volume control and the Gmail notifier in there), it sometimes stucks open.
Cannot do anything more than opening / closing the tray icons menus (like the one containing the gmail notifier operations like "Check mail now" etc.) or use the browser (once launched through the "Viex inbox" option).

No other part of the menus are responding (chat, browser, main menu), and cannot compress the tray by pressing the "\/" icon again. Tried to press, and keeping pressed the escape button but with no results.
In order to recover I must press the power button and choose to shutdown the tablet. (touch or buttons are responding).

Seems like the tray is keeping the focus over any other thing that is not an application window.