My wife's HTZ Rezound (which is identical to mine) has developed a bizarre habit - when you press any of the four red navigation buttons at the bottom of the phone, they activate the icons shown directly above them on the screen, instead of their usual functions (e.g. on the home display, the Home button activates the Phone app, the Men button activates the email app, the Back button activates the Messages app, and the Search button activates the camera app).
We've no idea how this happened, or when (as my wife rarely uses her phone), but we can't find out how to restore normal button usage.
We've not installed any new apps recently, and the phone software appears to be up-to-date (or, at least, it's the same version as my phone which is behaving normally).
Anybody come across this and, more importantly, know how to get rid of this unwanted behaviour?