I have a fairly new GL503VMF (the one from Bestbuy for $1300 with Gsync 120Hz display). Not 502, but the new 503 series.
I like it very much so far, but one issue I haven't been able to fix is that I get occasional audio pops from the speakers. I do NOT hear them at all when using headphones, only speakers. They are not too bad, or too often, but they are a little annoying when I hear them.
I think it may be the Sonic Studio III software, but not 100% sure.
For now, just wanna confirm if others with a GL503 have noticed audio pops from the speakers.