After the loss of the connection to the coupling facility structure, CA TPX does not rebuild the connection and has to be restarted.
A 'System Managed Rebuild' of the TPX structure will occur when all of the following are true:
CA TPX for z/OS
Without these prerequisites you will see messages like the following:
CF-EVT-EXIT: tpx_name CONNECTIVITY LOST, STRUCT xxxxxx
In this case, the TPX started tasks must be restarted in order to rebuild the connection to the structure.