I have read about this multiple times today in search of comments from R* on server issues. It is basically my fix for everything X1 related but it does work every time for the empty server bug.
If you have the bug complete the following…
- Quit GTA
- Goto settings > network settings> alternate mac address
- Press Clear
- Allow your X1 to restart
- Make sure your NAT is still open
- Restart GTAO