Hi!

What could be possible conditions to cause such a problem ?

As others have suggested, check the defrost timer. You will likely find it
at the bottom of the fridge, maybe even behind the little (mostly)
decorative "vent panel". While you're at it, test the door seals. The test
I've used is a dollar bill wedged between the metal and the door seal with
the door shut. There should be tension when you pull on the bill. If not,
you have a leaky spot in the seal.

The timer runs all the time, and you can advance it with a knob or by using
a screwdriver as a test. You should be able to cycle the compressor on and
off, as well as the heater. However, it's the compressor you will notice the
most.

The FAQ for this group suggests failures can occur if the timer gets cold or
the power goes out. Grease in the timer might harden to the point where the
timer can't run or parts break.

William