when does it delete, when you click save it doesn't apply?
when loading it doesn't load the events?
after a certain amount of time from clicking save/loading events, they will be functional then suddenly deleted?
does this happen with a clean install?
does this happen on other servers and you're trying to event something on them? (could be client issue of not being able to load events on bricks from a save file or save events from the event GUI)