I have played my friend's ESP Eclipse II guitars. All 4 of them. (White, Black, Honey Burst, Trans Red Quilt)
They are exceptional. Awesome playing and sounding guitars.
If I were into the Les Paul style guitar, I would own a couple myself.
I agree with the others, get it professionally inspected.
I have an SG with bridge rattle/buzzing. This reminds me that I still need to resolve that. LOL!
I had the same on another Gibson and replacing the bridge fixed it, although that may have been extreme as it could have only been a single saddle.
I have another SG that the high E buzzes against the first fret when played open.
That is due to the nut being badly worn and the string is seating low. (Something else I need to get resolved. :lol
I doubt you are having my SG troubles but I mention them as there are all kinds of things that can cause a string to buzz.
Maybe you have a fret that is not level?
Good luck, you have a great guitar, just needs to cure its "sniffles".