This can happen if;
1. High humidity in the air can cause excess ice on rear cold plate inside fridge, and this also means more water in the self evaporating drip tray under unit to dispurse. So at times you may have water form under unit where tray has over flowed.
2. Unit could have small gas leak, this may show a lot of ice at one corner of the 'cold plate' on inner rear wall of fridge
*If continues after defrosting unit then contact us below.
3. Unit door is not sealing properly, check no big gaps are showing (small gaps are fine)