EF 24-70mm f/2.8L USM Causing "Error 01" Message

[rosenphoto]

So, this is crazy and driving me nuts. I hope someone has an answer for me. 

I'm a wedding photographer.

I have a 5D Mark IV and a 6D Mark II and a range of lenses. 

A month ago, mid wedding, I start to get error 1 messages with my 24-70 2.8L lens. This is series 1 lens. Got that message on both camera, so assumed it was the lens. 

That lens is my workhorse, so I tried to get it repaired. Was told it would cost me $500 and take over a month, so I'd have to rent a lens for that time, which would have run $300, so $800 all together. 

Decided to buy a used lens for $750 instead. 

After a week, that lens also started showing error 1 messages on both my cameras. 

So, returned that lens and got another used lens and as soon as I put it on the camera, got another error 1.

So now I've gotten error 1 messages with three 24-70 2.8L lenses on both of my cameras. All my other lenses work perfectly on both cameras. Just the 24-70 2.8 L is giving me the error. 

So it doesn't seem to be the cameras, it seems to be this series of lens. 

Tried updating the firmware on both cameras, all of a sudden the original lens starts working. But then, after 100 pics or so, it goes back to error 1 again. 

I have four weddings in December, I need to depend on my equipment, but I'm scared to use this lens, and this is my primary lens. I use it for 80% of my images. 

Can't afford $2000 for a new lens. At my wits end here. Is it possible for a series of lenses to become incompatible with all my cameras? That seems improbable? 

What's going on?

I don't know what to do. Can anyone help?

[normadel]

There have been numerous post here on the original 28-70 2.8 L lens having a ribbon cable problem. If Canon is no longer repairing it, the alternative is another repair service.

Your lens is broken. It may not be worth it to you to fix it.

[BigLannie7]

Thanks so much for your reply. Is a ribbon cable the same as a diaphragm flex? I was told it could be that too.

[normadel]

A ribbon cable is a flat flexible cable.

[ovdmse]

I'm worried about something, my 24-70 L of the first version is already 12 years old, everything is fine with it. But what can you expect from him? And most importantly, how to solve such problems?

[Mano-CD]

I have the same problem with the EF 24-70 mm f2.8L USM that I use most on my Canon EOS R6 with a ring adapter. Err 1 messages most of the time. The odd thing is the camera takes the photo as set, but shows the error message after every shot. Sometimes, it does not happen. My lens is 17 years old and Canon does not accept it for repair. I live in Colombia. The last time I had to send the lens to California for repair. it cost me $500.

I tried the same lens on my Canon 5D MII. No problem. It works properly. So it is not the EF 24-70 f2.8L. I tried a 40 mm prime lens on the R6 with the same ring adapter. No problem, so it is not the Adapter. What is it then with the 24-70 f2.8 and the EOS R6. My feeling is that it is being caused by an Autofocus setting. It is difficult to nail the issue. Canon does not seem to care.

I am a Microstock photographer and the 24-70 is my workhorse. I am really frustrated and annoyed.