"Server not responding" error during compact of names.nsf

Our servers have stopped responding a while into the compact of the names.nsf file which is run nightly.

Does anyone know of a way to enable debugging on compact or some other way to be able to try to find out what in the names.nsf file is causing this problem.

The servers are able to finish the compact but we have monitoring software running on the servers that try to reboot them as Domino is not responding. Since NAB is quite big they are “not responding” for quite a while.

Thankful for any help