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Q:

All the four doors lock automatically at random while driving on 1999 Volkswagen Passat

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Once the doors get automatocally locked they can be opened with the lock / unlock switch on the driver side door
(1) Answer
sounds like you have automatic door locks which lock automatically when the car is in drive and the vehicle is travling at a specific speed which is usually 10MPH. Check your owners manual if you want to deactive this option.