CTREE error 163 - no more room in server lock table

Currently running QNX 2.2 with CTREE version 4.3B. Started receiving the error 163 a few months ago and can’t quite seem to put my finger on the cause. I have checked the c-tree server sign-off stats and the server status report and there doesn’t appear to be any obvious pending lock or unlock issues. Anyone seen this and have any input?