kontact5 does not start up correctly most of times. When you start kontact,
akonadi spawns, but kontact still waits for it to start. If you kill akonadi
manually, kontact window would appear, with a button 'start akonadi'. Clicking
on that button would restart akonadi, and 1/3 times kontact starts working, but
it also may lock-up or quit with error.

I'm experiencing this problem with clean openSUSE 42.2 beta 1 and with openSUSE
42.1 + KDE:Qt5 + KDE:KF5 + KDE:Applications repos