Default Stock WiFi suddenly lockscreen lag horizontal

Hi folks, I have my Wifi Note since half a year now and I love it. Unfortunately it started having problems with lockscreen lag when unlocked horizontal. Doesn't matter what unlock feature is enabled (swipe, password, pattern...) when I want to unlock it, it freezes and some seconds later it shows the vertical (portrait) lockscreen no matter I still hold it in horizontal (landscape) orientation...

Heeeelp

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