Corns are always looking for a way out, my corn doesnt do it much anymore because she knows there is no way out! Mwahahaha!
I would suggest something your little snake can climb on, maybe you can suction cup some plastic plants to the side of the tank, mine really like to be on them leaves! I would also suggest some sticks so she/he can climb up it.
Personally, I kind of likes seeing my snake trying to escape, it was pretty cute, but now she just comes out during the night and I never get to see her much. Just get her/him something to climb on of some sort, and make sure the top of the viv is secure!
Good Luck!