After coffee spill my screen goes black.

I spilled a cup of coffee on my Macbook Air 13 2015. I have cleaned the keyboard and it is working fine now. But my screen goes black time by time.. Like my machine goes to sleep. When I click some button it shows login screen. After I login its goes black again and the same process happens continuously. It is not happening every time.

So what is your suggestion? Thanks

PS : I want to mention I had three spoons of sugar in my coffee.