These have been around in the game since it came out, but they’ve gotten a lot more prevalent lately. It’s the issue where the sound cuts out and you have the pulsing buzzing sort of sound. Before it would happen pretty much only in WvW, but now it’s happening almost everywhere. One sure fire way to replicate it is to do the Claw of Jormag event in Frostgorge Sound. At some point during the first phase of that fight the sound bug will always kick in and even cause the client to outright crash. It’s still not entirely consistent for when it happens, but it’s always at some point during that event.
As I said, this issue has been around since the game came out and it’s something everyone experiences at some point, usually very often if you play WvW a lot.