Admin password stops working, then starts working after reboot

Hi everyone! I just installed Manjaro KDE edition on my laptop, it’s a Thinkpad X1 Carbon 7th generation.
I have used Manjaro before, almost 5 years ago. I’ve been using Linux here and there, so I’m not a complete noob, so believe me when I tell you I’ve never seen anything so strange. After a while of using my laptop, and I think it happens when the laptop comes back from standby mode, the password to get into my account, and the admin password quits working! I then reboot my laptop, and I can login and do everything just fine. This is a fresh install of Manjaro, only a few hours old, and this has happened a couple of times now. Any ideas? Thanks!

Might be related (??)