The first step to see if you can resolve the S0C4 is to perform a COLD start of the CA MAT server task 'MATUNER'.
You might see messages similar to:
TN3325I CA MAT ANCHOR BLOCK LOCATED AT 0057EE0E0
13.48.59 STC09195 TN1066E Pause Element Token error in IEAVDPE2, 00000FFF
13.48.59 STC09195 TN1053W ASID not found for SMSVSAM, VSAM RLS DISABLED.
13.48.59 STC09195 TN5219I SECURITY HAS BEEN SET TO NONE
These message occur because support was added for VSAM RLS. It depends on the customer running an SMSVSAM address space. If you are not using RLS and you don't have an SMSVSAM address space when CA MAT tries to establish support you will see this message. It's not a fatal error.