Thats pretty bad, even by modern ELectrolux Group standards!
Our old Electrolux Premier (dated from around 2000), which ran identically to a Zanussi Jetsystem Excel model, used to leap about like it was possessed, but it never damaged the glass, possibly because the glass didn't reach as far into the drum as on your AEG. It would often move a good foot out of position though, even when washing relatively light weight loads. We had Service Force out within the first few months as we couldnt believe it was normal. They fitted a new motor for some reason (can't remember why) but claimed the leaping about was normal.
The noises it'd make would have you think it was near death, but it soldiered on for 7 years until the motor packed up and took the PCB with it.
The Zanussi Essential we have now is much better by comparison, though it too occasionally jumps more than you'd think it should. Over the weekend it went abit wild and turned itself round so the front faced a 5 o'clock position (6 o'clock being normal) but this is the first time ive seen this in 22 months ownership. The suspension does seem very soft though, and the drum often moves around loads, albeit without the machine itself shifting.
Would AEG not be at all interested in hearing about your machine? Im guessing not from what ive heard about Electrolux Customer Care, but surely something is buggered on your machine to allow it to do what is happening?
Best of luck anyway,
Liam.