I also have this drone (my first). At 1,420 feet away, I lost signal. When I went to look for it based on the included app telling me where it was, it was no where to be found. Two weeks later an employee of the local USDA found it not more than 15 feet away from the strobe light that I found detached from the drone.
Apparently it tried to return to home when it lost signal, But the RTH wasn't set high enough to clear the trees and it crashed into one making it unflyable again. RUKO heard about my issue and offered to replace the drone with an updated one. It flew fine a few times, but then it developed a problem of not being able to track GPS satellites. RUKO was made aware of this and nothing was done to correct it.