[Q] systemUI crashes when switching between apps

i have bought a FAKE galaxy s5, with decent specs, and it works for what i needed it for, but for some reason, if i the screen is in landscape mode, and try to switch apps(going from my browser, to music player etc.) it will come up with an error "unfortunately, the process com.android.systemui has stopped" and then it locks the screen, when pressing ok.

so far i have tried the following.
installing fancy switcher, and set it as the default.
tried with new launchers.
rooting the phone.
used an Xposed module, to try and help.

and im out of ideas. here are some its specs, in case its needed.
Android version: 4.4.2
screen: 5 inch 720X1280
CPU: MT6592
GPU: Qualcom Mali-450 MP
total ram: 1GB(spoofed to 2 GB)
internal storage: 2GB(spoofed to 16GB)

any idea how to possibly fix this? it has a recovery thingy, but its very bad, and im not sure if it will completely destroy the device, to install clockwork on it.
and if all else fails, i cna reset it, and start over, so dont be shy about suggestions. and even if reset fails, it was not that expensive, considering everything works. just worse specs.

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