Can not unlock laptops after meeting, when laptop is offline then it works. (opens in new tab)

Users can sometimes not unlock laptop after break.Since a few weeks we have this ugly problem in our company domain. Users who went in a meeting or go for lunch can sometimes not unlock their laptops when they come back. Windows often says "Password incorrect" or "your password have been changed on an other device" but the password is not wrong.There are users they had this issue a few times in the last weeks, other users never had it since we know about this issue.People work in the same tea...