Out of the blue today when I prepared to print my first shirt I noticed the wiper assembly was not returning to its forward position after head cleaning. It is remaining there and will not move. If I do a number of head cleanings (4 or 5) it may move like its supposed to. But, the next time I do one, it's stuck again. I have cleaned the entire area well, cleaned the encoder strip, etc. Does anyone have any other ideas?