[RichardoX]

Tell me, are you using #npcspawn create after you use #dbspawn or are you adding #npcspawn add. Create creates the npc in both the spawn tables and npc_types however, add simply adds an npc that already exists in npc_types into the various spawn tables. I've seen issues with using #npcspawn create on an npc that already exists. It SHOULD create a new entry in npc_types but I've seen it do otherwise that could cause instability.

Also, check your logs folder to perhaps see a reason why nexus zone is crashing. The most common reason why is that your database isn't up to date with the latest sql entries in the change log(s).