UMAT Multi-element Error

Hello All:

I have written a UMAT code to predict the viscoelastic behaviour within a
shape adaptive structure. I have followed similar steps used in Abaqus
subroutine manual, I have applied this UMAT to a single quad element and
it works as predicted. But when I apply it multiple elements model it
breaks down. 

Is there any special command i need to put in UMAT subroutine to account
multi element analysis? I will appreciate all related comments,