This does happen, sadly, but rarely. When it does, here is usually the story of events:
- The computer will be put into Sleep mode by a client/user/etc. from the KDE Launcher.
- The computer will sleep, and drive mapping will save to the kernel from mtab and fstab. Power mode S3 is entered.
- The computer will wake, bringing up KSession, which actually works now.
- The desktop will come back up when the password is typed.
- The drives can somehow remap incorrectly (differently than the pre-suspend state), causing issues until reboot. Wireless also will either be buggy in this case or quit working altogether.
Fixes: Turn off changes if you can and want to (keeps a lot of errors like this from occurring), or don't use changes on the same volume that the known issue occurs on.
This is about it... and I do find it (other than on that one flash drive)

to be rather rare in occurrence.