Hello. I'm hoping i have an issue someone can help me address. I was recently out in Palm Springs flying both of these drones on a project I'm involved in. I noticed that one of my P4P would not maintain altitude. If you hold forward on the right stick, it would literally over about 200 feet crash into the ground from about 20 feet if I do not intervene. I tried everything; imu calibration, all settings to default, compass calibration, etc. No luck. I then noticed that my other one did the exact same thing. Neither can maintain altitude regardless of mode. I did the same thing to this one as well with no luck. I called DJI but they had no clue. I also fired up my Inspire 1 thinking maybe it's some kind of glitch, but it too did the same exactly thing. After some trouble shooting, I realized that I was actually below sea level. I thought this was surely the issue as it affected all three drones. Fast forward to today, when I'm back at home (800 ft msl), and they are doing the same thing. I again redid the imu calibration and compass, but neither fixed anything. I can't figure out what could be going on here. Do I have some rogue setting selected on all of these that is causing an issue? I have tried with sensors on, off, etc but to no available. I'm not sure what to do at this point honestly. Any help much appreciated. Thanks.