Random Access Memory (RAM) levels above 90% may cause the device to perform poorly when running certain apps. Review the amount of RAM being used on the device and Clear memory if the RAM levels are above 1.8GB.
Clearing the RAM ends running apps and stop background apps. Verify that app data is saved before clearing memory.
Clearing the RAM may resolve issues with the device/display freezing. The device may be running low on memory (RAM).