Comment 12 for bug 72545

About workarounds:
- Opening a new instance of Konsole (or two) occupying some new pts's should normally help.
- Also, you can set the option "timestamp_timeout=0" in '/etc/sudoers', which will force 'sudo' to always ask for the password. (This wouldn't be suitable for the default installation, IMO.)
- I think this is a rare enough occurrence that, more importantly, also goes away after you reboot (or wait a while), that putting in workarounds for this in the default installation shouldn't be needed. Much better to fix the cause than go around it.