I have a phantom 4 advanced that Ive been having serious trouble with when it comes to keeping the horizon level. I have updated to the latest firmware and calibrated gimbal but its still leaning down on the right side. Sometimes its level in flight and then sometimes its not, Im finding myself spending more time checking and fixing horizon issues then actually getting footage. I know this is a pretty common problem with the phantom line just wondering if anyone has a solution?

I noticed the manual adjustment for gimbal tilt and this seems to work but I am just wondering.. Is everyone having to manually adjust their gimbal tilt in flight or is this something I should consider sending this P4A back into DJI for?

I would recommend you to calibrate IMU, then do gimbal camera calibration immediately. Adjusting the gimbal roll is complementary, no worries.