Putting the system into standby mode requires the root password.

Could be general problem, not necessarily tied to KDE, but I don't know.

Whenever I put my system into standby mode by pressing the power button I get asked for the root password. The same behavior may occur when you put the system into standby via the start menu (or application launcher, or whatever it's called), though I haven’t tested it myself.

Thanks will get this fixed

A reboot fixed the issue for me. Had some other weird issues with stuff that needed me to enter my root password for some reason. Don't know what happened here. You can close this bug report.