The flushing of the fabric conditioner from the drawer into the drum is from a solenoid operated water valve which is not used for the initial filling or rinse cycles. This one valve may have packed up.
Check it out-does water flow when on this final rinse spin cycle or is it stopping after spinning cycle because no water/conditioner went into the drum? If this is the case the machine should be in 'pause mode' because it is waiting to finish the last part of the wash cycle
GB in Wales, February 2013