Hello,
I have encountered some very unpleasant situation while doing radio range tests. For some reason a LAND mode was activated when RC connection was lost (FAILSAFE_RADIO-1). However in params I have set RTL mode if radio connection is lot. I double checked that from log.param file.
I have tested these settings and FailSafes earlier while flying close by. It was working as intended. When RC controller was turned off, the drone went to a RTL mode.
I have following settings:
FS_EKF_ACTION 2
FS_GCS_ENABLE 1
FS_THR_ENABLE 2
Radio FailSafe uses “No Signal” method
Good thing was that I had reliable ground station connection and I could stop that LAND mode and set it to RTL. However I had some trouble as when the RC connection came back and lost again, that caused LAND mode again.
It was a close call that I was able to get the drone back safe and dry, without landing to a lake 
I don’t understand what could have caused LAND command in FailSafe. Could some one smarter look in to this.
LOG file:
https://drive.google.com/file/d/11v2BvnYCb6A5zrIDq7hiMjJnoQ-jRU7D/view?usp=sharing