> One thing I've "noticed" (but not gathered any statistics on, > so it might not be real), is that the failures of this sort > tend to be on "large-ish" temp files. (I.e. that contain > longer dired-listings - say more than 20 entries or something > like that.) Attempts to access small subfolders seem to > succeed. This had me thinking about race conditions and > such, but I didn't know what to do with that idea...
Consider filing an Emacs bug report: `M-x report-emacs-bug', so the Tramp maintainer can take a look. He will let you know whether he thinks this represents an Emacs bug.