had the same issues as everyone else, except for me it happened in this order:
At first my notification bar was finicky, it would work sometimes but I had to slide it precisely in one place. I attempted resetting my phone to factory settings but the problem persisted. I made due with it, until eventually the entire notification bar stopped pulling down, it only works when I get a notification and catch it in the act.
More recently, a few days ago, the back, home and multitasking button started going out on me. Now, the whole bottom row won't work - ever as far as I can tell. I've had the new update for a while now so it's strange that it stopped working so suddenly. It's concerning that Sony has yet to do anything about it, they could at least give us the option to roll back the update...