Has anyone else had problems with the Britax baby safe car seat? We use ours with the Britax Isofix, the trouble is that whenever we put little'un in the seat he ends up with his head slouched forward and laboured breathing when he falls asleep. I've adjusted the straps, tried the seat with and without the new baby booster cushion and tried a neck support but nothing helps. I have resorted to tieing a head band around his head when we go on long journeys to stop his head going forward. Britax have been no help and blamed the isofix- suggested we use the seat with just the seat belt- what a waste of money buying the isofix then. Our car is a 3 series BMW and we checked it would take the isofix and seat before we bought it. Using a friends maxi cosi at the moment... any suggestions..??