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From the .out files it is clear that time step has drastically reduced and the run was terminated. Check the interface 1.
When the time step is reducing during the run :
Check which object is responsible for the low time step (.out file). It can be an element, a node or an interface.
>For an element, check the related material.There must not be an error in the units system that this data is given in. check the element size also.
>For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified.
>For an interface, the gap of the interface must be verified if some failure happens on the master or the slave side of the interface.
Could you share us .out file of the run?