This broken pipe error basically means that the ssh session was terminated or blocked. This may happen when IP addresses change (client or server), a firewall in between drops the session (because of inactivity), systems going into sleep and waking up when the server disconnected the session because it could no longer communicate, or the connectivity between client and server (and vice versa) is interrupted. Basically is says that the connection was interrupted (so it is not that the connection is interrupted after of the message).
It may help if you can explain the situation, from what client are you connecting to what kind of server (AP, Controller, Airwave, ClearPass, anything else) and under what circumstances you see these broken pipe errors. Please contact Aruba TAC if you need assistance in troubleshooting, as this feels like something that is good to have someone live looking with you to the issue.