Unity Freezes after editing code.

Whenever i open unity and then open a script (sometimes this happens if i just open another program)

Unity completely freezes and takes up all of my memory:

In order to close it i have to end the task in my task manager. I have no idea why it suddenly started doing this and i don't know what to do.

Please help!

PS. i am using version: 2017.1.1f1