change position on timer

I was trying to make my actor go to one position, and then back to the original position randomly on a timer.

I've tried to create it, and it goes up but never comes back down.
You can see what I've done below in the link the my file.

Thanks guys if anyone can help

https://www.dropbox.com/s/8ovj0pt6xnsxfsv/changePositions.zip?dl=0