Minecraft Launcher keeps logging me off

Hello,

I am getting quite frustrated because everytime I update something in the game asset files (resource packs, mods, etc.) or simply longer time of not playing (few days are enough) log me off the launcher. I have to log back in, which is, sometimes, quite challenging. Sometimes it doesn't work and it keeps telling me that an e-mail or password is wrong. Clearly, it isn't. I am using a password manager to get into my Mojang account (since my old password got leaked somehow, I had to change it), I guess that MC Launcher is incompatible with password managers, right? I am using the one provided by Google, passwords saved in cloud and protected by two-factor authentised Google account. Sometimes even putting in right email and password trigger login error. But what really frustrates me is that combination of this one and whenever I leave some days of playing or do some changes to the additional assets to the game (accessing and changing contents of ".minecraft" folder in %appdata%), it logs me off and forces me to log in again.