I experience odd motor pulsations when flying my octocopter and am not sure what is causing it. I was also flying my drone in PosHold today and it started losing altitude without me being below midthrottle. Any advice on how to correct this issue is appreciated. https://drive.google.com/file/d/11vZWhos3FNemBgGb7A6vI7Wpr_0esuO6/view?usp=sharing