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Thereof, can a pipe stop leaking on its own?
If it doesn't the fitting is apt to slide right off the pipe or leak or both. And yes, a slow leak MAY stop on its own. This is especially true if you have high mineral content in your water.
Also question is, can a water leak fix itself?
Water leaks can be a daunting problem to have. What started with a slight drip can result in a flood that costs you big. You may hate the idea of calling plumbing companies but one thing about water leaks – they won't fix themselves. They'll only get worse with time if they aren't fixed correctly.
Plumber's putty may only be used to prevent or stop leaks in specific areas. It shouldn't be used interchangeably with other products such as caulk or tape.