I recently bought a Philips 28dw6557 digital TV. However a problem soon became apparent. Sometimes the TV would get stuck on the digital station you were watching and you could not change to another digital station, also the digital teletext would stop working. The picture did not freeze up, the TV just refused to change channels, even the channel change button on the top of the TV would not work. You could switch to analog with the A/D button and everything worked fine, channels changed, teletext worked ok. But go back to digital and you were stuck on one channel with no way to change, even the OK button would not bring up a channel menu. The only way to fix this was to switch the set off and on again. So the TV was replaced, but it soon became apparent that the new one had the same problem. Also the picture was worse on the new TV, noticable distortion in all four corners, seen worst on digital teletext, and the bottom right corner slightly out of focus. So the second TV went back and a refund was obtained. What was going on, and why was the problem the same on 2 TV's?