I got around it by setting the base values in data
It was that after 45sec the approach I was using to create the AttributeSet was no longer creating the AttribtueSet so it was null
I set it in the actor’s Data and that seems to always work so something wonky with Unreal and working differently in Build vs Editor which I have learned is fairly common 
Just found and fixed another issue where … play in Editor works perfectly play in build or standalone … it does not