Static simulation Failure with temperature dependant curves

I am trying to do a static test on a pressure vessel assembly. I have to conditions 2277 Bar @ 20°C and 1518 Bar @ 200°C
I have two materials 17-4ph H1150 and A4-80 bolts I have the relevant data from ASME II part D but as soon as I change from temperature specific values to temperature dependant curves the solver fails.
I am using FFEplus and the iteration fails about 30/40 min point.
I have run a simplification on each of the components separately with temperature dependant curves and they all work.

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