I may have found a firmware bug for the R6 MkII

Back in February I was shooting a lot of birds in flight with my R6 MkII and the RF 100-800mm andEF100-500mm lenses.

  • My setup was pretty straight forward. Shooting in T mode with a fairly fast shutter speed and Servo AF
  • Shooting in either Fast or Fast+ burst mode
  • Using Back Button Focus with Eye Detection on the AF-On button

I would be following a bird and do a few short bursts of just a few seconds and suddenly the camera would start firing off shots even after I took my finger off the shutter release button. It was ramdom but seemed to happen every 2nd or 3rd burst. Typically the camera fired of 8-12 shots before stopping.

I sent it to CPS in Virginia, the camera was under warranty and I am a Gold member. After a week they sent it back stating they could not replicate the issue. They suggested if it continued to send it back but try to take a video of it doing this. So, when I got it back and reset all my custom settings it did it right off the bat so I had my wife sit next to me with her iPhone and do a video. I called the CPS rep telling him it was doing it again and I had video so he sent me a label to ship it back. They had it for over a week and then shipped it back to me saying they replaced the body top cover which includes the shutter button.

I reset the camera to my settings and went out to shoot a grandson's soccer game and it did it almost immediately. I really wondered if they had test fired it before shipping it back. So, for a 3rd time I contacted CPS and they sent me a label to ship it back to Virginia. After a week, I contacted them complaining that I needed my camera for several shoots coming up so they sent me an R6MkII loaner body. And guess what? After I set the camera up in the same method and started shooting it did it again, just kept firing of shots.

After contacting the CPS rep once again and telling him that the loaner also did it, he said they would contact Canon-USA and possibly Canon-Japan. A few days later he said that Canon-USA said it was most likely a firmware bug and they would work with the engineers at Canon-Japan. He said Canon-USA said to return my unrepaired camera and get the loaner back. I told him, no way. I figured keeping the loaner would give me some leverage to get my camera issue figured out. It's taken 3 months and 3 trips to CPS in Virginia and I still don't have my body back. And to top it all off, my one year warranty expired last week so I told the rep they should extend my warranty as I am worried that if they decide they need to work on the camera it won't be covered and I will have to pay. He said he would do his best, maybe extend the warranty by 6 months or something.

One concern I have is if they release the R6 MkIII they might have less incentive to do a firmware update for the MkII.
 
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Some questions out of curiosity:

1. Do you load the settings from a file, or enter everything manually?
2. Did you try doing only some of your settings one-by-one to figure out which one it could be?
3. Did you try a different card, and/or no card (set allow lens release without card to yes to try this).
4. Does it happen with all lenses you own, or are some fine? You say it occurs with 2 lenses so it's unlikely the lenses, maybe some don't have the issue.
5. Does it happen in airplane mode?
6. Are you using a fully charged and not super-old Canon battery?

The more you narrow it down yourself, the more likely it is Canon will be able to fix or actually try to reproduce it. It would be best to have a short and exact list of steps from a freshly factory reset camera that triggers it.

Believe me, having such a list of steps in writing makes a huge difference when it comes to resolving bug tickets. I know it's not your responsibility, but Canon CPS really seems rather lazy in your story.

To me it sounds like a bug where the camera is too slow and/or blocked by something and gets stuck temporarily. Like what used to happen when typing really fast in Word on a slow computer and you'd see the characters appear only after a few seconds.
 
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