My browser doesn't want to open a new site in a new tab. It would show a notification that 'Connection closed by remote server'

When I tried refreshing the sites that I previously have opened it could open it (So far, Tumblr is the only one still working okay. Reddit crashed) or crashed and show the notification 'the server timed out'

So I decided to Uninstall the browser but first I have to backup my bookmarks and tab using Opera Link. Here is where I encounter another problem: The log in process are taking me forever... And then it showed me a notification that something is wrong with my connection server.

I don't know whether this have something to do with it but i just recently got back from a trip to China, the problem first appeared when I connect to the WiFi in China.