Mine came out so I replaced it with a little heavier ply and pinded it in place. Added a partial rib on both sides in the center of the tank area (helps hold the tank also) and pinded it from the bottom. No problems since then. If you did then same thing with what is there you should be fine. I fly off a grass field and it is kind of rought so I am sure that was part of the problem.

I did not use the stock hinges, I used the Radio South hinges.