If you are having trouble logging into the game, follow the steps below.
Step 1: Change the connection from 4G to Wi-Fi.
Step 2: Turn off the Power-Saving mode.
Step 3: Perform a Hard-Reset of the device.
Step 4: Check that your device has more than 3 GB of memory free.
Step 5: Turn on Game-Mode (or Performance-Mode). [for Android only]
Step 6: Reduce the refresh rate [Hz] of the screen. [for Android only]