We are writing a scientific article with the current character count of 135,332 and no active comments or suggestions. Since yesterday, any attempt to make a comment or suggestion leads to this popup:
You've reached the document limit for comments. Please make a copy of the document without resolved comments to continue commenting on the new copy.
Since there are no active comments, I understand that this is caused by the history. Googling shows that this is a very rare problem. Is there any information on the limit of the total number of comments and suggestions? The suggested solution is to follow the advice and make a copy of the document. In our case this is highly undesirable: we have ~10 active editors, the paper is about to be submitted and we really need the history, at least the named versions.