Same symptoms here, same syslog message whenever the issue occurs ("Auth: sddm-helper exited with 9").
I'm on a Dell XPS 15 7590 with Ubuntu Studio 21.04 development/alpha/daily, all packages up to date. Prior to this installation I was running Ubuntu MATE 20.04 and never saw this issue, but of course Ubuntu MATE does not use SDDM.
Same symptoms here, same syslog message whenever the issue occurs ("Auth: sddm-helper exited with 9").
I'm on a Dell XPS 15 7590 with Ubuntu Studio 21.04 development/ alpha/daily, all packages up to date. Prior to this installation I was running Ubuntu MATE 20.04 and never saw this issue, but of course Ubuntu MATE does not use SDDM.