I saw that they acknowledged a bug in the server software. So did you try upgrading?
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
. 2020-04-20 17:34:45.607 Copying finished: Transferred: 257,814, Elapsed: 0:00:00, CPS: 7,032,687/s
> 2020-04-20 17:34:45.607 Script: close
. 2020-04-20 17:34:45.607 Closing connection.
. 2020-04-20 17:34:45.607 Sending special code: 1
. 2020-04-20 17:34:45.623 Main session channel closed
. 2020-04-20 17:34:45.623 All channels closed