Hello. I have herelink and cube blue. Gps is good and Loiter mode on. Drone flies about 1.5km and then radio/video connection lost. Drone not return home. Remains in place. FS_OPTIONS is 0. Do I have to change this to 4? Thank you.
You may have a look at the failsafe settings:
https://ardupilot.org/copter/docs/radio-failsafe.html
https://ardupilot.org/copter/docs/parameters.html#fs-options
I looked at those instructions but I didn’t understand. Too many options. Can someone tell me which settings will work simply if the radio / picture lost. And then the drone will come back to home point. Thanks 
The best thing is to understand it and try it and then choose. Arducopter is not made for people who don’t want to understand the most important stuff -> DJI 
no offence