Process Model - Process Details

Question:

We are running a process model which has considerable number of steps, where few in a loop to accomplish our goal.

We could see the 'Process Details' printing the values which is really helping us to debug and verify.

But 'Process Details' could print this only for the first few steps but not for the rest of the steps (in the later stages of the process model).

How can we see the complete log of all the 'Process Details' and variable values.