I have several issues with power armors. This happens to me frequently.
1. Trying to transfer a Power Core when standing in front of the skeleton results in getting stuck because the game keeps trying to get me to the point of the back side of the armor where you insert the power core. My character can't reach this point, so it keeps walking, walking and walking in an attempt to get to the other side (through the armor).
I can't abort this in ant way. The only thing I can do is load a previous save.
Well, I avoid standing infront of it now, but I'm sure others have issues as well?
2. After having removed arms, legs, torse and helmets from a power armor and upgraded/changed them they simply dissappear from my inventory. When I want to insert them again (pressing R) they have simply vanished. They also disappear if I change my mind after inserting a couple of parts and removes or changes parts. They vanish in front of my eyes!? What is going on here?