mine did the same on a Zanussi. Try cleaning the base filter. You may have a cut out if the water cannot rinse away fast enough.
Bri
April 2011
You should check the spray arm on the top for scale if it gets clogged the water has no where to go so the pressure will push the tray forward onto the door.
Stab in the dark
March 2011
faulty latch or spray arm not rotating
ck
January 2010
I can answer this question...
the door on my aeg dishwasher keeps opening mid-cycle?