Rockstar have apologized for the recent Grand Theft Online issues and are assuring us that they have Tech monkeys working on fixing the multiplayer modes and data corruption both day and night.
Rockstar had this to say on their official support page.
Updated 1:00 AM ET 10/2/13: We are continuing to look into these issues and are working around the clock on resolving them as quickly as possible. This includes close monitoring of our Support systems, forums, social media, and in-game data to measure traffic along with Community sentiment to ensure ongoing improvements to stability. Please stay tuned for more updates.
Some issues appear to be much better than 12 hours ago, so it looks like Rockstar has everything under control.
Let us know your thoughts on this below.