It looks like you've already opened a Support case for this issue, so that is probably the best route.
They are asking for DEBUG logging, when this issue happens, and I would agree, that the DEBUG logging and the client and server logs, would be helpful in trying to figure out what is happening here.
Are you using a plain direct connection to the server, for this client, or is there SSL or proxy connection involved here? I wonder if that could have something to do with it. Anyway, the DEBUG logging, and logs, is a good start for the Support folks, to see what may be happening.