anyone else had this problem with a QP ?

Hi all,
i have a 2005 QP with 4k miles ands it's started making a woorying sound when driving off from standstill. If i pull away with anything but the lightest prod of the throttle i get a squealing noise which sounds like either wheelspin (which is def not) or when i 've heard old fan belts on their last legs. The effect also seems to hold the car back a little from delivering an "instant" lurch forward.

The first few times i heard i thought perhaps greasy road or similar but it is now happening at virtually every set of lights unless i'm very very gentle on the throttle. will be booking in to dealer soon but just wondered if any other owners had experienced this fault or have any idea on poss cause

thks
stuart