After lifting weights at gym i gets snapping/popping in my elbow?

I been lifting weights for few months but all of sudden i am getting popping sound more like a snapping whenever i straighten my arm i get the popping sound it feel lile something is loose in the arm and when i keep bending and straightening the arm i gets the snapping sound its not too painfull but elbow feel little week. what causes this? should i stop the weight lifting?