Ok sadatdaniel . I have the same laptop Dell Inspirion 7559.
Mar 3 2017
Jan 17 2017
I have intel celeron n2840 with HD graphics ( GPU clock speed 311 MHz
Turbo clock speed 792 MHz) . I can't find what HD graphics model it has.
Jan 11 2017
I can confirm this. The bug is not pressented in solus 1.2.1 ( with the lastet updates to 31 december 2016 ) but happens in latest snapshot 1.1.2017.
Dec 21 2016
i found this https://github.com/vikoadi/indicator-kdeconnect which suggests it's not necessary to have plasma DE if you also install this indicator .
Dec 17 2016
I encountered this bug 2 times ( on different laptops ) . I had to hardreset it !
@Timalex i don't think it is shortcut related . I guess it happens after you leave it alone for 30+ minutes . I can't reproduce it .