I have noticed that Kontact from time to time simply won't start, or better yet, sometimes when trying to close it, it closes the window but "kontact" process hangs. Subsequential attempts to start Kontact fail. A simple "killall kontact" helps.

Any ideas? The problem occurs once or twice a day, but I really cannot tell what would be the cause.

My setup is vanilla opensuse 11.2 with appropriate KDE4 (I didn't perform any upgrades yet, but there's no upgrade package for kontact anyway)