Minecraft Launcher Flickering Between Offline And Online

About three weeks ago, my Minecraft launcher began doing this weird thing seemingly at random. Every other day or so, the launcher begins flickering between 'PLAY' and 'PLAY OFFLINE' every two seconds. During this time, I will be able to launch the game but unable to connect to very specific servers. Attempting to connect to a server during this time will throw any number of errors: Invalid session, server requires public profile, etc. Up until now, I've just accepted this fact and only played the game whenever it allowed me to. Today, however, I tried logging out of Minecraft and logging back in. Doing so removed the Minecraft username tied to the account, so I can no longer launch the game as I do not have enough time to reenter my username before the launcher flickers back to offline mode. I know I can probably wait until a day where the issue isn't present to fix it and go back to what I was doing before, but I'm hoping to find a permanent resolution this time around. Any help would be greatly appreciated. Thanks!