EOS cameras "ERR O1" CORRUPTING LENSES

[JAYSTATON]

I have 3 EOS cameras: 2 EOS R's, and 1 EOS R6.  All 3 are showing the error message "Err 01".  I have looked on line and people are saying it is a lens contact issue.  It is true that if you switch to a different lens, it normally fixes itself(after you have removed, then reinstalled the battery.)  

However, it started 1st on one of my EOS R's using my Canon 24-105, f4.  Then within a week, on my 2nd EOS R.  And within the 2nd week, it started effecting my EOS R6.  Then, the same thing started occurring using my Canon 24-70, f2.8.  A unique issue is that sometimes it doesn't happen when shooting at the widest aperture.  But as soon as I stop the lens down 1 stop, it occurs.

I have heard the only cure is to send the lens back for repair to fix an aperture issue.

I don't believe it is a normal prime lens issue, but rather a zoom lens issue on the new Canon EOS cameras.  I used both lenses on my older Canon 5D Mark II for several years without issue.  Then, I switch to the new EOS cameras and both lenses go bad within 2 weeks?  I don't think so.

  I have cleaned the contacts on all the cameras, on the lenses, and the lens converters. And the error message still pops up.

Has anyone else found the same issues?  Or a fix?

[Mano-CD]

I have the same problem. I use the EF 24-70mm f2.8L USM with the ring adapter on my Canon EOS R6. Today it started giving me the Error 1 message. My prime lenses work fine on the R6. The 24-70 works OK on my old Canon 5D MII. Strangely on the R6 it seems to take the photos 90% of the time but continues to show Error 1 screen.

I have cleaned all the contacts as specified by Canon with a dry cloth. On the camera, the adapter and the lens. I have removed the battery a couple of times and put it back. It does not help.  The problem persists. Canon will not accept a 17-year-old lens for repairs. I live in Colombia. The last time, I had to send the lens to California for repairs and it cost me $500. I am really annoyed with the lens I use most.