[Managed speed issues]

hello everyone upload problem video when descending

[Managed speed issues]

Hello everyone, when the speed is reduced is what appears on the page go around? , of mcdu, configure that page before takeoff?, do not do the altitude push before takeoff? , I do not configure the go around page, before takeoff, I take off with the altitude driven and I have not had that problem of speed change, I have problems it is the descent that falls like stone