Mobile Turning Off Randomly..

Hey!

I use a Micromax YU Yureka.. My mobile was dropped into water accidentally. Within two days, I got my mobile serviced and the service team said that only the display was repaired and we got it done. Now, when I open new apps, or sometimes even gallery, the mobile turns off randomly... So guys, What do you think is the problem? And, please help with the solution to this problem.

Thank You!