Android Studio hangs / Freezes when project build fails

Question

I am experiencing a very wired problem since this evening.

If I have any errors in my android project, and build is failed, then my Android studio gets frozen / stuck. I

Answer 1

If you are using Android Studio v1.2.1.1 or newer and you are using Macbook, I've recently seen that if your device is connected to your laptop (by usb have no idea about over the wifi) and you sleep your laptop then login again, Android Studio hang. Therefore, you need to unplug usb cable then you should see Android studio is happy and then reconnect your usb cable.