I got another invalid session on Minecraft, and now I want to know. Why is the session invalid?!
I'm also looking forward to all the answers!
I agree, you are not the only one.
Maybe your internet sometimes makes short dropouts. That could be up to me.
My router has just crashed… #Teledoof
Yes that's probably it.
I have o2: D
The solution I know is: Log out and log in again. Then it should go again.
Either your internet or the mojang server. That's it. The best solution is Mod ReAuth, available until version 1.12.2. So you can simply log in again without having to restart the game.