LipSync is a problem that plagues many receivers, The earlier Manhattan range seems to suffer a lot from it, and programmes becomes unwatchable when the sound is more than 250mS away from the picture.
Quite often its the design of the chipset that require patches to handle the fast decoding ot he transport stream, sometimes its the Korean software designers being lazy in the firmware contents.
Either way is not the LNB or dish.
Try unplugging the receiver from the mains and reapplying.