Hi, I played on your "Cruise Ships" server twice tonight (10pm GMT+1) on Cyclops & then Cotopaxi and I experienced this bug on both these maps and other players experienced it as well. It didn't occur immediately when I started playing on these maps. Maybe SourceMod is responsible: I've spent hundreds of hours playing The Ship for several years and I think I've rarely experienced this bug, maybe only on SourceMod servers. So I think you should remove SourceMod & Metamod for a week to see if your server can be used without this bug occurring.
This is a familiar bug. It happens sometimes. It should be fixed now. I will investigate if this has got to do with SourceMod. Thanks for reporting this.