Long response time when renaming

Hi My company is runneng Axapta 2.5 SP3 on MS SQL 7.0 SP3. Two weeks ago after a user crash, renaming accounts take wery long time. The server sems to respond af fist, then there is a long break, ahhen the renaming is complete, Other users ars running very slow during renaming. We have reindexed all databases and performed all the usual maintenance stuff, but the problem persists. Any suggestions ?? Best regards M Jepsen, Systems Consultant