Macbook Air Magsafe 1 charging port burning out repeatedly
My theory is that is due to very high humidity.

It is 84% in Mumbai, Maharashtra, India right now!

Humidity can form conductive film between the pins that lead to continuous eddy currents.



So how does that apply to your situation?

Magsafe is a magnet (strong magnet). There is always a lot of microscopic particle attracted and magnetized. Normally that would not do anything, but with high humidity it dissolves the micro particles in the water droplets and allows them to flow between Positive and Negative pools of the plug, thus leading to burn marks.

Make sure your Magsafe plug is dry, and only charge it in low humidity environment.  Use Compressed Air can and frequently blow dry the magsafe.

Also put can put your Mac in a fridge YES fridge (not freezer) and charge it there.