Opera 48.0.2685.52 - infinite reconnecting of VPN

I downloaded Opera portable from https://portableapps.com/apps/internet/opera_portable

version - 48.0.2685.52

And I have a huge problem with literally infinite reconnecting of built-in VPN.

And there is no difference which server you would choose - Canada, USA, Germany, Netherlands, or "Auto".

At the same time - there is absolutely no such issue in the official setup version of Opera (the same version).

So, I assume, that this issue comes from portable edition.

Does anybody know how to fix it?

Thanks!