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I thought the same thing, but even with suction on minimum it still does it (and barely extracts any dust). It's a Bosch green and I think it's just a bit naff. Think I'll give that dewalt a go, unless you have any other suggestions? (Rotex is out of budget)
Hovis-
Weird then, as you say maybe just badly designed. My Rotex went bang one day and I looked at a replacement, I couldn't believe I'd paid anything like that for it. It encouraged me to fix mine.
It depends what you're doing with it but maybe a 2nd hand RTS400 would be better than a dewalt. The RTS is my most used sander by a big margin, they are very reliable too.
Airhead
The reason for the sander vibrating is the suction is too strong, if you have adjustable suction then turn it down or add some kind of adaptor that can be opened to reduce suction at the sander plate.