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ADAMS/Solver stops with no error statement in .msg file.

Hi All,
 
I am running an ADAMS/View model which contains elements from ADAMS/Machinery and Gear/AT.
 
The model will stop solving after about an hour and a half with no error message or any additional lines written to the .msg file (verbose output option not selected).
 
Has anyone ever encountered this? Not sure why it stops solving and drops the licenses. When it's a solver error an error message is written to the .msg file. It doesn't even write "end simulation" to the .msg file.
 
joe.