I have a lenovo thinkcentre a70z all in one computer the sound works for 2 to 3 mins then stops i updated the sound drivers?

And it keeps doing it after the sound driver update what is the problem and how do i fix it?

If it is still under warranty, take it in for warranty work. Most likely it is a heating issue, that disables the speakers when it gets warm/hot. They would, most likely, replace the motherbard.