This was a problem a long while ago, but now it seems like it's happening again. The problem occurs when you open a new page on the site, and an ad plays that may not even be on your screen with sound turned on by default, often at maximum volume.
I can't point out the exact ads, but I have so far seen it happen today with an one advertisement for almond milk or something, and another advertisement for something Final Fantasy related. There are likely more ads than those on the site that are doing this, but I haven't seen any yet myself. I experienced it twice and just muted the site altogether to protect my years.
This is problematic since you spend a lot of time going from page to page on this site, thus loading a new advertisement with the potential to automatically play sound on a regular basis. I don't know why the ads are even allowed to play sound to begin with, although I suppose that probably requires a greater understanding of the site's code and the ad services used.
The only way for someone not in charge of the site's code to efficiently deal with this is to mute the entire site altogether. It's the nuclear solution, but unfortunately it's the only solution.