Error Code 16:16:57 on MimoLive

I’m doing a local record (not streaming) and getting “This output destination has performance issues. (16:16:57)” and dropped 100’s of frames on the recorded file.
This is a new error.
Recording ProRes 422 LT to the local drive on M1 MacMini. MimoLIve v5.11
I’ve been recording this way for a while without issue.
Any ideas what the error code means?
Thanks in advance.

Local drive more than 50% filled?

The local drive has plenty of space. It’s 250GB, and only about 20% filled. The recording with the issue was running only 10 minutes in the end and took up 8GB, or so.