My Minecraft Launcher flashes every second "Oh no! something went wrong, and we couldn't connect to the Minecraft services". Also Play button flashes from "Play" to "Play offline".  I figured it was just a buggy launcher so I updated  it (didn't help) and then reinstalled it, but it also didn't help - the red warning on the right up side (that it can't be checked which products I own)  appeared and flashing is still there.  

Also, when I start my Minecraft launcher, I always have to log in (my account is saved, but I need to click Let's play). It didn't happen before this problem.

So I can't access servers, where autologin was enabled - it says, that I should restart launcher (doesn't help).

It started to occur when I changed email and surname on my Microsoft account. I don't know, if it is a reason or there is some buggy update of Minecraft Launcher.