Why does the VPN turn after short period of time even while online on my IOS

The VPN is always turning itself off after a short period of time, when online my iPhone. I, then unable to do anything! I then have to constantly have to turn it back on. Why does this keep going on?

It is still having same issue with what you have suggested. I will keep trying to give it a chance to work.

Do you also have Norton Mobile Security,NMS, installed? If so try disabling the Web Protection feature and see if that changes the behaviour of the VPN. 

If it does allow the VPN to stay connected, please send logs from your NMS app.  Re enable the Web Protection feature. Then use the device until you have the issue with the VPN again. Then tap on the three bars at the top right of the NMS screen. Then tap on Help, then tap on Send Error Report. Please include your forum user name and a link to this thread with your submission.