Hi,
This issue is also observed by nearly all of our lab members, including myself. This happens sporadically, sometimes it will be fine for days, and once in a while one of my ssh logins will continuously spew out this error message, while other simultaneously active logins will be fine. This happens when connected with -X or -Y and authenticated via a key or password. Also seems to be OS independent since I have observed this using ssh on Linux (Ubuntu 20.04), Mac OS (big sur), and Windows 10.
Best,
Halit