According to what I found on web there were some parts changed in newer revisions, maybe it caused the issue, because in older reviews this was not an issue, struggling with it too now.
If you leave a throttle for 5-10 seconds at the same position - your next move will require a lot of force to get it moving, then it's fine until you leave it again. Even if I tune the friction knob to the point where the handle just slides off by itself - still gets stuck if left 10+ secs. Tried a grease that came along with my Gunfighter in a package - did not improve much. Maybe I need to retry and start from the just few droplets like it's displayed on a screenshot from reddit post above.