You might be on to something there. The same problem appears to have been reported here. Again, the client is an iPhone which always seems to be the devices that have problems.
@martinr You say you don't have any problem connecting? Are you still using your iPhone to connect? If so, would you mind telling us what client version you are using, and what router firmware version.
Sure, Colin. @ColinTaylor
Yes, I still use my iPhoneSE on the latest iOS (12.1.4)
I use the OpenVPN Connect App (latest version 3.0.2)
https://itunes.apple.com/gb/app/openvpn-connect/id590379981?mt=8
I also use this app on an iPad.
On Windows 10 I use OpenVPN v11.10.0.0
Router is the wonderfully reliable RT-AC68U running the wonderfully reliable RMerlin firmware 384.9. (For once, I’m up to date with the firmware and not ashamed to have to admit to being 5 versions behind.)