Worth to say that I had version 3.3.4. Digging deeper I found strange error, on server machine that advised me update to version... 4.0.0 at electrumapps.online lol
After some research I found that 3.3.4 could be susceptible to phishing. After updating to 3.3.8 all the problems are gone.
So the main thing for all of this - be careful and keep your version up to date and everything will be fine.