There are a few people that have VPN profiles for access to corporate intranets; I’ve only seen one report on one of those, and it was because the certificate on the server had expired. Deleting and adding back the account fixed it. The vast majority of VPN problems are from users who only have VPN because it is an in thing or some internet “guru” said to on Youtube; VPN really isn’t needed on an iOS device; all it does is slow down the network connection to about 25% of its capacity and waste battery energy. And most users don’t really understand what it is, either. Apple’s Private Relay is actually better than VPN and is much more secure, because there is no middleman (the VPN provider) who records everything you do over the VPN connection. And possibly sells that information (certainly sells it if the VPN service is free, because they need income to stay in business).
VPN frequently creates more problems than it solves. But one important fact is that when you install VPN it configures itself to the specific hardware, iOS version and network that the phone uses. If any of those change it can break the VPN. So any time you change any of these you may need to delete the VPN app and profile, restart your phone then add them back (if you still want to use VPN) so it can configure itself to the new environment.
Thus, you don’t have to give up VPN if you really want it. Delete the profile (which automatically restarts iOS) and you can add it back.
