iMessage locks up after multiple relogging

Hello, first time on these forums 🙂

I have a problem with iMessage. I have decided to try out AppleScript and wrote a small script that logged me in and out for fun, but after using it for like 5 times I couldn't log in at all! It finally worked after retarting the computer, but only once, and after logging in and logging out I couldn't log back in!

What could be the problem? Am I not allowed to log in and log out so many times? :C Please help

I have OSX Yosemite v 10.10.3 Mac Mini from 2010