connect to Forticlient telemetry and WIFI awful

[Forti-Mon]

I have an SSID for staff working fine.

The second we connect to the Foriclient Telemetry the internet keeps dropping

I have a constant ping running without a blip - connect to Forticlient and then i get lots of failures.

Need Forticlient for VPN

tried turning off all the different components but still the same

What is causing this?

Fortigates, Fortiswitches and Forti APs 

[MZBZ]

Do you have VPN autoconnect feature enabled? is VPN auto dialed when you connect to EMS?

Are you using Application Firewall? disable it and try again. could be strict application firewall rules. 

[Forti-Mon]

no auto connect - VPN is manual

no application firewall