If it was software/firmware a reset will clear it up. But https://www.google.com/#q=camcorder+screen+fault&tbm=vid shows it's always a hardware issue.
The screen on our PanasonincHC-V110 camcorder has started to switch up and down, so that the image keeps appearing upside down/rightway up/upside down over and over again. It still records and the files upload to our PC fine.
Is there anyway of resetting the screen software on this camcorder or any other way of solving the fault?