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Please attempt to connect your controller to a 5GHz hotspot, such as your phone (ensure your phone or any hotspot you choose is emmiting 5GHz), as a potential solution. It is important to note that this is not a guaranteed resolution, but it may assist in resolving the issue.
What if my Mission is flying higher than the maximum RTL height, will the drone drop to that height and RTL?
No. The maximum RTL height is 100m, If you are flying a mission at 120m and an RTL is hit, the drone will RTL at the height you are flying at. The drone will never decrease due to this setting but if your mission is lower than the set RTL it will rise to the entered height.