Hi, I have recently brought a Phantom 4, this is my first ever drone so new to the amazing technology. My phantom 4 does not hold altitude when flying the faster you fly the worse it gets 30-40 ft variation even when flying in no wind.
I have calibrated everything numerous times but still no improvement.
I welcome you comments

If youre talking about high speeds in sports mode or atti mode, there is some altitude loss, so do fly too low over fields trying to get that racing feel ;)

Hi Bashy, thanks for your reply however this is happening in “P” mode!
I fully understand that this will be more unstable in both “S” and “ATTI” modes.

Please check if the propellers are all in good condition, try to refresh the latest firmware, and calibrate the IMU in a flat surface and calibrate the controller. If the issue persists, you can send the drone for further diagnosis. https://repair.dji.com/repair/index?site=brandsite&from=nav

Hi Thor, Thanks for your reply, I have already added new propellers, refreshed the firm ware and calibrated the IMU on a flat surface however I did not calibrate the controller.
I will carry out all again and re-evaluate the issue.