800D creating .aeg, .afg and .gro files on memory card - what?

FFcossag wrote:

"The question is now how did the files get on to your YouTube video description."

" though a mystery is still how they got onto your YouTube channel."

I want whatever you're smoking, lol. I uploaded and linked the files so that people watching the video can download them and look at them. The reason for doing this should be ratherobvious.

It isn't obvious because the link you posted is recursive, it takes whoever uses it to one of their own YouTube videos if they have one and thus it took me to one of mine.  I had therefore to surmise what you meant by "YouTube" description and took it to mean "Video Information".

You would have needed to post the link to that video using the Video URL field.

So apologies for my confusions but in this case you didn't make things easy.

As stated before, nothing but the camera is writing to the card. We know this because the camera's clock isn't set right and the time stamps align with it rather than real time.

Either way I've sent the camera to Canon in order to have them remedy the issue. I think what's happened is whoever worked on it during the last warranty repair forgot to take it out of some diagnostic mode that's just not made to be stable during actual use outside of the lab.

Another odd thing that the camera did was adding little white "X" markers to pictures, presumably marking dead pixels, making it further more suspicious that it's stuck in diagnostic mode.

Well good luck with Canon and I hope they find the issue for you.