We've had this phantom 3 advanced for about 3 days now, flew it the first day with out issue, second day towards the end it was getting weird but today if you hover it, it leans back and flies back. We did this in a few spaces and it always flew backwards when it was hovered.
The wind wasnt a factor because we went inside a building, we calibrated the compass and swapped the props, still flies backwards :/

is there another calibration we can do?

Did you calibrate the compass inside the building? From what you said it sounds like you did. You need to calibrate the compass outside at the field you are flying.

The compass calibration is intended to compensate for metal on your quadcopter. It must be done in an area free of magnetic fields and metal. Calibration should be done anytime something is changed, like adding a gimbal or other metal, a crash, or contact with a strong magnetic field.Do not calibrate your compass where there is a chance of strong magnetic interference, be carful of steel reinforcements underground. Do not carry ferromagnetic materials with you during calibration such as keys or cellular phones. Do not calibrate beside massive metal objects, like cars or manholes.

It is best to do your compass calibration in a open grass field.

DJI-Dave Posted at 2015-12-10 14:36
The compass calibration is intended to compensate for metal on your quadcopter. It must be done in a ...

Hi!

In recent weeks we have opened many issues of problems with the horizon gimbal.

First case
Second case
Third case
Fourth case
Fifth case


And many more......     When we have a solution??

Hi ,Sam
Please try an IMU calibration with the DJI Go App .

Yep, that was going to be my next recommendation
I would like to know if he did that compass calibration inside though.