Replying to Jvc jy-hd10 or sony hdr-fx1

i just baught a jvc jy-hd10 but for some reason it is not the best picture quality for the first part when panning and sees light the exposre gets all wearid and i gat a bounch of moving pixles that a eiter lighter or darker than the light but if it is not moving it is great. this is real hard to explane! any way i was wondering if all hd cameras do this because i still can return it and get the sony hdr-fx1 for almost the same price but i was just wondering if it will do the same thing when panning shots. please help i only have one day left to return it.