Make sure you have one of those builds installed as they were released to fix the VPN issue.
I updated with the menu option - didn't fix the problem.
I updated by downloading "Opera Stable for Windows" using the link you provided - didn't fix the problem.
VPN was working fine before two days ago.
As you can see, I'm up to date.
So far, just today alone (a full day after updating), it hasn't cut out or denied access, but that wasn't the case yesterday by any means. So I am guessing there are still a number of glitches somewhere causing it to cut out. Will continue to update everyone with my personal experience.