I also encountered this error while on vacation and after off-loading images to a Chromebook and thence to Dropbox. Pulling the battery and replacing it reset the camera and fixed it for a short while; using a 70-300 Tamron lens exacerbated the problem, with frequent "Busy" signs in the viewfinder as it hunted for focus, and eventually the camera started to take a picture, flipped up the mirror, and froze, mirror-up! After going through every camera-related trouble-shooting operation that I could think of, I recalled that I had once owned an Olympus Z-3030 camera (for 10 years it gave better pictures than any non-pro camera I could find, but used SmartMedia memory cards, which are unobtainable now, so is no more!). The problem with the SmartMedia cards was that if you didn't format them in the camera, and/or if you used them for certain types of file, they became unusable. So I pulled out the (64 GB) card I was using, borrowed another (1 GB) from my wife, and the problem vanished. Err 80 was suddenly...