I find this really annoying and it gets worse all the time. The addition to not only sort answers based on upvotes is great - things get outdated and new answers might keep it up to date. At the start, it felt like in the top 10 answers it was 50% highly voted answers, and 50% new.
Now when I get into any question, I immediately scroll to the bottom to find the relevant answers. Why not sort answers based on votes, where recent votes are counted as more important? Keeps things up to date but does not penalize older still valid answers.
(Might also be that I am in some A/B test.)