Connection hangs on consecutive ssh reconnects but works on Emacs restart

[Mikhail]

Greetings and thanks in advance!

I am having troubles with connecting via ssh multihop to a remote file 
system. Weirdly if I restart Emacs connection works for some time. 
However after a while TRAMP starts to hang on requests. Restarting Emacs 
helps for some time again.

Attaching the trace I get in the debug buffer (I had to interrrupt the 
process with Ctrl-g because it seems to run endlessly).

Thanks,

-Mikhail

tramp.txt
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