OK. That's why I suggested resetting all settings. I have seen that work for the problem that you are experiencing. There is no guarantee that it will work, but I have seen it work in the past.
But If you are not comfortable with resetting all of the settings - then don't do it. I don't want you to try something that you're not comfortable doing.
Do you backup your iPad with iTunes?
I hope so as well. Have a safe trip and enjoy!