Congrats on the new led buddy. About the stand, make sure the stand is fixed properly. The stand's base is thicker on one side and thinner on the other side. The thick side needs to be oriented towards the backside of the led and the thinner side at the front. Once its installed that way, the stand will click into place and then you'll tighten the screw. I also faced the same issue but now that I've fixed it properly, it sits firmly.
Thanks brother for liking it. I bought it from media international in Blue Area. They're galaxy's dealers. Once you've bought it, to check it if it hasnt got any flaws, download Dead Pixel Tester DPT software. It would reveal any dead pixels that it may have. Goodluck.