Some time you might get error regarding lost of connection to exchange management with powershell :
Connecting to remote server <Your Exchange server FQDN> failed with the following error message : The WS-Management service cannot process the request.
It can happen because Powershell App Pool being overloaded , Just open IIS management and recycle the application pool
logon to the exchange -> open IIS, run inetmgr -> go to application pools-> recycle or restart MSExchangePowerShellAppPool application pool
Try again if that didn’t help try restart the server