This can sometimes happen when your iOS device is trying to connect to FalcoVPN with the Connect on Demand option enabled in the FalcoVPN app settings. Internet will only work while the VPN is in a connected or disconnected state, and not in a connecting state. To regain internet access on your device, simply disable the Connect on Demand option in the FalcoVPN app settings. To do that:
Go to Settings > General > VPN > FalcoVPN > and disable Connect on Demand
When you face this issue, please submit the issue log and your public IP at that time to the FalcoVPN support team so it can look into the issue further.