Urgent: Skydroid H12 Pro Range Limited to 100–150 m—Radio Failsafe Engaged

We are experiencing a serious range limitation with the Skydroid H12 Pro. The link consistently drops at 100–150 meters, triggering a Radio Failsafe. Also, the strength keeps fluctuating even at 1 meter, from 100% to 20%.

Anyone else facing the same?

I couldnt see what I was looking for in the manual, but is there a setting somewhere for the Country ?
Some transmitters have a default that barely works, and the correct power level and frequencies are not used until a Country is selected.