My N900 display has started to make noise when pushing it either with finger or with stylus.

The sound (and feel of screen somehow being loose - not sideways, but depth-vise) started first from the left top corner and the status bar where profile, connections, alarms and availability etc. are set. It did the same soon after from the bottom of the screen and now the whole screen does cracking sounds although not every time that I push an item on the screen.

Has anyone else had the same problem? So far, the display works fine though. No issues of responsiveness or clarity or anything. Would this be ok for change by Nokia under the international guarantee?