1, The cold water you get from the refrigerator comes from the cold water tank in which it is cooled. As the tank is of limit volume, if you take large amount of water continuously, the water you take will be not cold enough.
2, The refrigerator was just powered on and fridge storage temperature was not reached your desired temperature,or the fridge storage compartment is turned off.
How to solve:
1,Please do not take water frequently or take much cold water once.
2,Please turn on the fridge storage compartment,and wait for some time.