Make sure you have the unit set to beginner mode and calibrated on a level surface. I bought the x4 with camera for my son for Christmas. He has been flying r/c planes, helicopters and drones for years and cannot fly this drone in expert mode, yet.
Here is a good article on the x4 with some good tips.
http://spincrisis.net/hubsan-x4-quadcopter-review/
Good luck.
Thanks!
That was a great article, I bookmarked it!