After the following messages, the Web Services task (WSEWSSTC) seems to just hang:
SMGR160E INVALID SOURCE RECORD LENGTH - 02475 EXCEEDS MAXIMUM RECORD LENGTH FOR TYPE - 00080.
Release : 18.0, 18.1
Component : CA Endevor Software Change Manager
Increase ResponseTimeout parameter (Maximum value is 1200 sec) in your webservices .cfg file. It's time while WS waits for single request processing. If it exceeded, WS will terminate request. It should resolve issue with STC hangs.