I think the cone detection you use of standing by a door or NPC you want to interact with is to unforgiving. I do not know how many times I have to redirect the character to get the prompt to show up, but it happens all the time leading to frustration.
Standing close to them, the text to interact pops up but disappears instantly, move my character little bit see it again and it disappears, I have to do this several times until I stand correct and the popup stays and I can interact.