3rd string buzzing on nylon string guitar

[tonejones]

Hey guys,

Anybody ever notice alot of nylon string guitars have a buzzy G string if you pick them very hard????

If so, any idea what the cause is?????

There's a nice little cheap nylon string in the shop right now with this problem and it's not the action (raised the G string with a small paper shim at the nut so there's no way it's hitting the frets and still it buzzes away)......

Any help would be greatly appreciated....