I know this is an old bug, but maybe it can be fixed somehow
When wearing one power armor, dying and being ressurected, your power armor will most likely not be active (while still wearing).
Although your weapons might look useable, they are not until the PA was dragged into the inventory and back into the armor-window. Zoning often helps too, but most of the time you will die in a cave or somewhere you don't want to zone.