I seem to have developed the exact same problem. I also have 7 200's that I had not been using for five or so years. Now that they are back in service with four ohm speakers this time I have the exact problem you are describing with multiple 200's. Going to call support to see if they have seen this before and if the 200's are worth fixing.
Have to be honest, not sure if I want 7 2200's now that this has happened.