This has been an ongoing problem for quite some time. Not limited to any particular iOS release.
I get the VPN connected. I open a browser. I open a new page. Loose connection.
Or
I get the VPN connected. I open a browser. I walk away for a few minutes. Pad goes into sleep mode. I wake it up. VPN is no longer connected.
Or
I get the VPN connected. I open a browser. I put the pad to sleep for a minute. Wake the pad up again, VPN is no longer connected.
As a result, I end up having to connect, and reconnect, and reconnect again and again. A REAL pain in the Ass.
Is it even worth the hassle?