This error can be caused by anything from a faulty custom ROM installation to a deleted OS file or a third-party app, and the following are the most effective methods that can be used to solve this problem:
Method 1: Wipe the device’s cache partition
a) Switch the device off.
b) Boot the device into Recovery Mode (which, on most devices, is done by pressing and holding the Power, Volume Up and Home buttons simultaneously).
c) Once the device has entered Recovery Mode, use the Volume Rocker to highlight the “Wipe Cache Partition” option.
d) Press the Power Button to confirm the selection.
e) Wait for the device to successfully wipe its cache, and then reboot the device.
Method 2: Get rid of any third-party apps that might be responsible
First and foremost, make sure that the “com.android.systemui has stopped” error is indeed being caused by a third-party app by booting the device into Safe Mode and using it for a while to make sure that the error doesn’t pop up.
Browse through the apps on the device to determine what app gave rise to the issue. This basically means that the culprit is the app after the installation of which the issue was born.
Get rid of any and all apps that you find to be suspicious, and in the event that there is more than one suspect, reinstall the deleted apps one by one to determine what app is the actual culprit.
Method 3: Reinstall or change the device’s ROM (for rooted users)
If the device is rooted and a custom ROM has been installed onto it, the problem might be the fact that the device’s data and cache were not appropriately wiped after the installation of the ROM.
If that is the case, all the user needs to do is reinstall the ROM or switch to a completely new one, making sure that they remembers to wipe the device’s data and cache partition this time.
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