Periodical black-screen after log in

Hi guys,

not always, but sometimes after log in into Manjaro OS, I get black screen with only mouse arrow visible. Then I usually hit CTRL+ALT+F4 and log in via command line and enter startx after which my Desktop Environment loads up as it should. I am running KDE Plasma DE with NVIDIA GeForce 635M (but I am always using integrated Intel GPU)

Any idea why its happening?

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