I have 2006 strat. It had big fret buzzing. I took my guitar to the Sam Ash, and got rid of most of buzzing. But I still hear slight buzzing on higher frets like above 12th specially when bending. Can I make my guitar perfect fret buzzing free?

Sometimes when you set up your guitar really well and you hear no buzzes at all.... next day you hear them sometimes because of the change of temperature ... I learned that from experience but it might not be your case