I randomly received this message in the logs:
spelsrvr 2172 SEVERE_ERROR allocator.c 527 Allocator BPData free chain pointer 0547B658 references a corrupted allocator
The logs are filled with these messages, and then the system becomes unresponsive.
The problem may be related to a defect, USRD Problem 3618.
The correction to this problem is included in 14.1 cumulative patch 4 and newer releases.