Please help Netters! I have a Bugaboo Cameleon. Recently,the seat has begun swinging right back when I bumped the pram up a kerb/step. I returned the pram to Mothercare and at first the assistant was suspicious of my complaint, but after calling Bugaboo she seemed to be of the opinion that Bugaboo were aware of this fault and said she was advised the white discs at the side were faulty. New ones have been sent, but i don't want to take a chance...Has anybody encountered similar problems?