Hello, I purchased this monitor about 9 months ago and recently while playing a game I noticed that the background had waves in it, i thought maybe I had too many apps opened or something. It has reduced since then but I just noticed it in desktop also. It's pretty much only visible on grey backgrounds, and it's not really that bad but my waranty expires in a couple of months and i just wanted to know if i'd have to take it there. Any advice?