Problem found - sort of. It's not the camera, thankfully. It seems to be a lightroom import error. I found another one that I knew had been OK at first. I checked my back up file (made automatically in lightroom when the original import was done) in bridge and neither file is bad. I had checked the one posted here in bridge before posting and it showed the same error but the back up file does not have the error. Looks like it may be wise to go to a 2 step import with the back up made separately in DPP to be sure there is an uncorrupted one.
Now the question is, is it lightroom or my computer.