When i'm trying to ssh to the server ssh user@xxx.xx.xxx.xxx 

i’m getting packet_write_wait: Connection to xxx.xx.xxx.xxx port 22: Broken pipe output. I googled for this issue. For the first time solution ssh -o IPQoS=throughput user@xxx.xx.xxx.xxx helped me to connect. But now even this doesn’t help.
i tried to configure ~/.ssh/config file like this:
Host *
ServerAliveInterval 30
ServerAliveCountMax 5 - doesn’t help.
Also i read about MOSH, but it needs to be installed on the server, not only on the client (i may be wrong), but how can i install it on the server, if i’m getting error while trying to connect…
Is there any solution?