Suddenly my BM server decided to throw 6038 errors randomly during the day

ON CONSOLE ONE CAN SEE:

13-11-2006 3:12:27 pm: ACLCHECK-4.80-5
An NDS API (NWDSLoginAsServer) returned error (-6038).


13-11-2006 3:12:27 pm: ACLCHECK-4.80-5
An NDS API (NWDSLoginAsServer) returned error (-6038).


13-11-2006 3:12:27 pm: ACLCHECK-4.80-0
Unable to build rules from BORDER.SPGS.UK NDS object (error = -6038).

Following TID (10092898) works for a moment, but fails after few hours

I really do not want to remove DS from this server, as it is fully
configured BM server (with VPN etc) and redoing it would be a nightmare

Any other suggestions?

Thanks

Seb