What browser / OS? I've been using Chrome on Linux and haven't had problems this week (it was slow, but never froze, for me for the week or so after the cow event).
Hi :) Can You give me your in-game id? You can find it at the bottom of the page. I'll try forward it to developers. They need your deck to find freezing exception.
Today had once that the game window went dark and unresponsive, with just the add below it shining bright. Other than that, we haven't had any freezes today. (This was in Chrome btw.)