The biggest issues in the first few days were the inability to join games at all and not being able to get past the tutorial. Title update 1.02 should have resolved this but if you are still having issues hit up Rockstar Support. If you get stuck “waiting for other players to join”, try going into a solo session through Pause Menu > Online > Play GTA Online > Solo. Having difficulty can also be due to the cloud or other services going down (see below).
Cloud Unavailable, Network, or Social Club Issues
Users may see a notification that the cloud service is down, have difficulty joining sessions, or have trouble using Social Club. Rockstar is working on these issues. In my opinion these are probably traffic fluctuations for the most part and Rockstar advises to try again later. Social Club is used heavily by both GTA V and GTA Online. When the cloud is down that leads to another major issue below.
Disappearing character, money, homes, etc
The biggest issue seen these days is having progress lost. The cloud service going down is a major factor since that service is what keeps track of you. If the service goes down while you are playing back out into story mode. Rockstar also adds“Please do not press ‘Retry’ on the message and do not proceed online with saving disabled, as this may lead to overwriting your existing character”. If go online and lost your character completely do not create a new one. Try again later or try going through the pause menu. After playing successfully, be sure to exit GTA Online back to story mode. This will trigger a save (assuming the cloud is up). Simply turning off your console or exiting the game completely without doing so may cause a loss of progress.