I'm having the same issue. It started today with the last update.
Opera started to "eat" a lot of RAM, to the point that Windows throws a message saying I'm all out of memory.
The PC goes back to normal when I close Opera.
Then the connection issue. Right now I'm using Chrome without any problems. Opera, however, is not connecting, like there's no internet connection at all.

I'm truly disappointed since I'm being using Opera as my favorite browser for years and now Chrome is working better.