I don't think there's any limit for data in the material. Have you checked the mesh and ITS are as per the required guidelines mentioned here under "Number of substeps per load step, or the time step size":
https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/ans_the/Hlp_G_THE3_5.html
-Aniket
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