It's not an isolated issue when you do what I said and see how many hits you get for ERR 01 Canon Ids etc. Also, if you do your research you will see that the 1DS3 had view finder alignment problems that Re all over the net. It also had ERR 99 problems.
I think the point is that your prior post strongly insinuated that there was or is a slew of problems with the 1DS MK3 across the board.
Clearly, this is NOT the case.
You are correct that it is not an isolated incident if it is continually happening on your camera - but as far as I am aware it IS isolated to your specific camera.
As above there was some reported view finder alignment issues with a small batch of cameras, which Canon rectified for those affected. You do not appear to have had this issue.
There have been no other reported issues that are not individually camera specific to my knowledge.
Sounds like you have just been unlucky - heck it happens to all of us. I had problems with a super expensive very high end audio processor earlier this year, but it was just bad luck with my unit. Not symptomatic of a wider problem with all units. Thankfully my dealer quickly replaced and I moved on.
One of my best clients had ongoing issues with a very expensive italian sportscar that shall remain nameless. Were all of this companies cars bad or plagued with problems?
No... he just got unlucky and ended up with a car that had a manufacturing fault that was intermitent and hard to pin down.
The point is - dont condem an entire model line because you have been unlucky.
Speak to your dealer, from memory you only recently purchased the MK3 and you will be covered under warranty. So no stress other than the fact you didnt have a back up with you. Lesson learned I would hope.