Zanussi ZWF142880S spins erractically?

Hi

A couple of times when I use the 95 degree cycle it seems to go wrong when it gets to about 30 mins left on the cycle. Up to that point it is fine and washes etc how it should. When it hits the 30 mins mark left it sort of stops, it does nothing and then it will try and spin but it's not like your normal spin which is gradual and then gets faster and then stops and then refills with water - it goes really erratically so much that it moves the washing machine out slightly. It then stops again does nothing, when I say nothing, its silent. This goes on till about 10 mins then it will be fine and finish the cycle of as it should.