I experienced some trouble in loiter then guided mode today. I'm using the px4 and when u switch to loiter u can use the guided flight mode from there. When I right clicked and selected a fly to here position on the map the altitude option came up and I selected 500'. My first time trying to go tht high. When the quad would get to around 300-350' the quad would enter RTL. I've looked over the full parameters list and do not see a altitude fail safe setting? Is there such a thing? Anybody experienced this same problem?