I and my colleagues have a lot of issues saving draw.io diagram, it very often fails:

If I try again, I got this error:

The workaround we use is creating a new digram and copy the XML, that is a total nosense and huge waste of time.
The same behavior was observed using different browsers, I guess it should not be a browser related issue.
* Is that a known issue?
* Any plan to fix it?
Best regards,