Try connecting manually to some random server. Click on the red dot in the bottom-right corner, choose 'Server' tab. Untick 'Select server automatically' and select a random server. If it still doesn't work then take a look at your firewall settings.
and it works by doing this. and sometimes it doesnt work. basically there are some programmatic issues also.
Note that you need to "right click" on the server in the list and select the "use this server" option for it to actually change to a different server. If you just "left click" on a server in the list, it won't do anything.
Also, in the past with older versions, I've had instances where I had to shutdown Electrum down and restart it to get server changes to take effect properly... but I haven't had to do that when using 3.3.8 as far as I can recall.
