I can confirm, that this is caused by muon-notifier service.
After renaming /usr/share/kde4/services/kded/muon-notifier.desktop file and
restarting kdeinit4 everything works fine and above two bugs are not
reproducible.
$ dpkg -l | grep muon-notifier
ii muon-notifier 1.3.1-0ubuntu2
update notifier for KDE
** Package changed: kde-baseapps (Ubuntu) => muon (Ubuntu)
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Bugs, which is subscribed to muon in Ubuntu.
https://bugs.launchpad.net/bugs/1053910
Title:
My plasma-desktop is critically sluggish, panel and kdialog reacts
after few minutes because of dbus Timeout problem
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https://bugs.launchpad.net/ubuntu/+source/muon/+bug/1053910/+subscriptions
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