VPN ISSUE ! As soon as i connect my Forticlient vpn it turns off the internet.

VPN ISSUE ! As soon as I connect my Forticlient vpn it turns off the internet. And luckily once in a blue moon it connects then it just cuts off after 5 minutes. I tried removing the power cable and adapter for 1 minute but still the same. I have seen so many people complaining on this issue. Its working fine other than that but as soon as I connect to vpn for working from home it doesn't work. I have Netgear AC1900 modem. Its very frustrating i think its time to switch to AT&T fiber if it is not solved