Slow email server

In the past several days, my email client reports "send receive error". I tell my client to try again, and it works. But then, later on, I will get "send receive error" again. Also, people trying to email me have gotten a "busy" error when their email server tries to send email to the Xfinity server. The server is SLOW. In the past, this has happened every few months. Then you reboot it, or whatever you do, and the situation is resolved. Please do this.