CRITICAL: NETWORK LOAD ALERT

We have so often received the alert message “CRITICAL: NETWORK LOAD ALERT: Too many requests for full definitions” from our SEPM since last year.

Is it the warning message that the performance of our SEPM server was NOT sufficient for managing our clients?

If the performance of our SEPM server is insufficient, which grade of the server can be recommend?

Or should we have multiple SEPM?

I describe our network environment as follows;

Domain                                   : Windows Server 2008R2

Network address                      : in one subnet  in one site

SEP version                            : 12.1.6 (12.1 RU6 MP1)

SEP manager                          : Independent server: HP ML310e Xeon 4core with WindowsServer 2008R2.

Client                                      : 80 x Windows10