Sound lagging

I've realized more and more that the announcement during games always lags. Like when some gets first blood the lady doesn't immediately say "FIRST BLOOD!" or whatever until around 3-6 seconds later. I dunno if it was always like this but when the announcement lags during fights it's kinda hard to realize who's dead and who's alive because nothing is said. Now, this doesn't always happen and the announcement is on time, but it usually does happen a couple of times per game. There's also weird noises after leaving a lobby that I think are the sound effects made when other players leave but it's kind of weird since it happens after I've left.

If this is just me, can someone tell me how to fix it?