FLICKERING DISPLAY Step 1 of 8
Try power cycling the device.
It is a good practice to power cycle the device periodically to clear out buffers and memory that may lead to intermittent issues.
Is the issue resolved after power cycling the device?
FLICKERING DISPLAY Step 2 of 8
Ensure that you are not using a case that may be interfering with the proximity sensor. Your touchscreen might stay dark if the sensor just above it is covered. Don't use covers or screen protectors (even clear ones) that cover this sensor.
A power-cycle of the device, after the accessory case/screen protector/holster is installed, is required to recover the proximity sensor from the locked state.
Did this resolve your issue?
FLICKERING DISPLAY Step 3 of 8
Check charger
Any charger other than an approved Motorola charger may cause interference (while connected) leading to issues with the touch screen.
To check, simply unplug any attached chargers or docks and observe the screen again.
Did this resolve your issue?
FLICKERING DISPLAY Step 4 of 8
Check memory
When the internal memory of the phone is full or close to full, you may experience a sluggish user interface, latency when switching menus, or in some cases the display freezing or reboot.
Check to see how much internal memory is available on the device: Settings > Storage.
Did this resolve the issue?
FLICKERING DISPLAY Step 5 of 8
Check and Manage Running Applications
Ensure you do not have too many apps running simultaneously as this could impact RAM. Check Settings > Apps > Running
To close a Running App touch Stop
Tips:
* Some applications such as Facebook may require multiple Stop selections.
* Certain applications will display a warning message:

It is recommended to select OK. If you notice other issues after closing the application, please power cycle the device.
You also have the ability to restrict the amount of applications running simultaneously which could help to improve any memory related issues.
To restrict apps:
1. Touch
or 
2. Touch Settings
3. Touch Developer Options
If you do not see developer options in settings, they are currently hidden.
For instructions on enabling, visit here
4. Scroll down and select Background process limit
5. It is recommended to select At most 4 processes
Did this resolve the issue?
FLICKERING DISPLAY Step 6 of 8
Use Safe mode to check apps and uninstall if necessary
Safe mode starts the device without any 3rd party applications being started. This will allow you to open apps individually to try and determine which app may be causing the issue.
Tips:
* Begin by looking for specific application types such as launchers, task killers or anti-virus apps.
* Application icons will still appear the same on the home screen or within the Apps menu. Apps will launch if you select the icon to activate, they will not automatically launch.
* Device will remain in safe mode until unit is power cycled.
To Enable Safe Mode
1. Press the Power key
2. Touch and hold "Power off" on the screen.
3. Touch OK when Reboot to safe mode appears
4. Phone will reboot and Safe Mode will appear in bottom left corner
5. While in Safe Mode, launch apps one at a time to identify the app causing the problem
6. Remove the app that causes the problem from the device
To remove an application:
Touch
or
> Play Store > Menu > My apps
Touch the application that you want to remove
Touch Uninstall, then confirm by touching OK
After you have identified and removed the application you can disable safe mode by power cycling the device.
Did this resolve the issue?
FLICKERING DISPLAY
Step 7 of 7 - Reset the Device
The last option is to factory reset the device.
Notes:
* Reset will require a minimum battery level of 20%.
* This will reset the device to the factory default state and it will clear out the memory buffers and reset the device and application data.
* Ensure any personal data is backed up.
To reset the device:
Go to Settings > System > Advanced > Reset options > Erase all data (factory reset)
Tip: After power up we recommend to NOT enter a Gmail account to ensure applications are not automatically downloaded. (You will be able to enter your Gmail account later and reinstall your applications). OR select "set up as new device" rather than restore from previous backup.
Did this resolve your issue?