pinging noise

Today, all of a sudden, my 594 b/E strings sound like there is a high fret. This guitar is 'new' to me - I bought it used almost two weeks ago. The guitar was perfect when I bought it, as I played it for about 2 hours before I went home with it. I even rehearsed a tonne all last week for a new...

So when I bought my SE Custom 24 last year I probably should have done more research about the guitar, was definitely attracted by the looks (IMO PRS has some of the sexiest guitars out there) but really it plays like a gem. I love the feel of it, but one issue that's plagued me for a long time...