There are many reasons why your fridge might not cool down or maintain cold temperature.
If the ice-cream melts down in spite of freezing or juice doesn’t cool, there might be loss of electricity due to broken capacitors.
Your refrigerator might be working just fine, but the power cord might have worn out due to an electric surge or an external force like a rodent which might have chewed onto the cord which leads to improper supply of electricity.
Inadequate supply of cold air into the unit might be due to blockage of vents in the fridge and freezer compartment which resist the flow of cold air.
Water leaking on the floor may be due to leak at the inlet valve which needs to be fixed by tightening the compression nuts. If the leakage is in plastic or copper pipe, you will have to get it replaced.
The supplied water drains into a drain pan under the fridge where it evaporates. In some refrigerators, drain pan is made of rubber instead of metal and cracked pan, causes leaks. Or rusted metal pans also can leakage of water.
Water might also leak into the compartment below or onto the floor if the drain tube in the freezer gets clogged. You can get this fixed by hiring repair expert. You just need to get the pipes unclogged and melt the ice buildup.