I have an Akai CFT2726 (Walmart purchase 2005) 27" flat-screen CRT TV. Sometimes a black rectangle the size of the setup menu appears and covers the video. It removes when you hit the "exit" button on the remote, but quickly reappears. It looks like a mask for the setup menu, or a blank menu. The TV uses Konka remote codes, so may be of their manufacture. Help appreciated.