A year or 2 ago, my fridge started leaking from the freezer (bottom freezer) so I tried to fix it myself, assuming that the drain was clogged.
I discovered that a large ball of ice had build up on the copper pipe leading to the coils in the freezer, so I broke it up, melted all the ice, and made sure the drain was clear.
After that, things worked pretty good except the ice ball was reforming. But I put off doing anything about it because we have a separate chest freezer. So we just didn't put much in the fridge freezer and it never leaked again, but cooled great.
Yesterday I got ambitious and figured I'd attempt to fix it for good. My thought was that the copper coil was supposed to have insulation on it since it probably doesn't get warm like the rest of the coils and evaporator during the defrosting stage, so it just never defrosted that part.
So I melted all the ice away and tried packing some insulation around it to see if that would help. Throughout the day it seemed to work fine, stuff got cold.
But then this morning my fridge was warm and the coils in the freezer won't get cold anymore. I ripped out all my insulation thinking I'd covered a temp sensor or something, but it still won't cool.
I opened the back of my fridge and the compressor seems to be running. It's humming and is hot, but the coils are currently at 11 C and probably because that's the air temp in the fridge now.
It was getting cold all day yesterday after I put the insulation in. It just stopped overnight.
The fridge is 6 years old.