Saw some similar comments like this back in 2014.
Since upgrading to the latest version problem has occurred.
Log in to hosting service seems normal. Directory listing is presented. From that point on, any thing attempted, such as opening a directory or viewing/editing a file generates this response -
Title is - Lost connection
"Disconnected from server
Error changing directory to 'documents'"
Spoke with hosting service Tech Support. They tried same using a different FTP client and had no error.
Side Note. I can right click on items and check properties, etc with no errors?
I downloaded FileZilla (Yuk) logged on and had no errors.