System: Gateways: Edit gateway => disable gateway monitoring for the openvpn.
When it happens, everyone inside the network can work fine, but they just cannot get out on the internet.
Can you still login to the pfSense webgui at this point? ==> check logs when the problem is occuring, it might indicate the cause.
Can you ping to a public ip (like 8.8.8.8) ? ==> if you can still ping that ip but have no internet, then you have a DNS issue.
in other words, we need more data.
you can ofcourse just contact pfSense support that was included with your purchase … but if this ends up being an end-user issue, then you might waste precious minutes in the contract. (I have no clue how the official support works, so i'm not sure how the "billing" works)