Need advise, my 1Ds has been acting funny of late and I fear it's more than a battery issue. I put a fully charged battery into the camera the other day and at first it read fully charged and then bam....nothing, battery read empty, so I went to B&H and got a third party battery for my 1Ds and charged it fully first and got the same exact response, so before I return it to KEH for repair is there anything I can or should do to try and fix the problem??