Yes I'm having similar issues - after less than a year the locking mechanism has become spongy, and I'm having rattle and squeak issues on the move. Interestingly they stop if I put the back in to the bed position, so I wonder if the weight of the back when upright on the less supported rear of the frame causes it to wobble?? I may try a wedge on the rear of the frame to support it and see if that stops the noises when the back is upright, and I need to consider whether the locking mechanism feels positive enough to do its job in the event of a crash.