Why is Yahoo keep making these mistakes?

For the last hour Yahoo have there main featured news headline linked to a 404 page. I'm in the UK, so its probably a UK problem only.

Often, when they feature a video on their home page, the links take you to a completely different video.

Also, for weeks now, Yahoo keeps taking me to the mobile website by default. I delete cookies, but it happens again a few minutes later.

Come on Yahoo, get it together.