I have had my BDP83 for a couple of months now and have noticed that somtimes when I put my hand on the top of the unit it jiggles quite a bit and sometimes it does not jiggle at all like you can't even tell it is playing a disk. Has anyone else had this happen withe their player or is something out of whack with mine? Should I be concerned? I havent noticed any problems with the output of the picture or sound or at least any that I have noticed.