#1
idk i bought it two weeks ago, its a maison acoustic something and sounded great
when buying it i asked the dealer to lower the action after which i got fret buzz so i take it back, he raises the action by changing the saddle and then i get this problem

IF U PLAY ANY OF THE STRING OPEN AND HARD ENOUGH JUST ONCE IT WILL START MAKING A WEIRD HISSING SOUND BUT ONLY WHEN PLAYED OPEN ,
i even changed the strings... it still makes the sound when i play any string open and hard enough
the fret buzz is gone though, just this open string thing!
what to do?? cost me almost 250$ ..

PLEASE, ANY ADVICE???
#2
The hissing is / could be due to bad string seating. This is when the complete curve of the string does not touch all the way on the bottom edge of the bridge.