If your Drone busted 400' you violated 14 CFR Part 107 and thats not a good thing! Take the above advice and set your RTH for a MAX of 400'
What airport are you a mile from!!?? If its controlled you need to be at least 5 miles away! Did you...
Because it's the law.
A mile from the airport isn't that far. I'm a couple miles from the airport and my ceiling is 300 feet IF I get temporary approval to fly here at all.
https://app.autopylot.io/#/map
Find out if you're restricted below 400'
My first night flight with my Air 3s went fine except for RTH. I was about 1/4 mile from home at about 200 feet altitude and hit RTH. The drone seemed to be struggling to decide what to do, would fly toward home a short distance then increase...