Halo 5 Data Sync

When you load up Halo 5 and press the start button, a pop up comes up on screen in front of the message of the day saying something along the lines of “Syncing game data for Halo 5” and then disappears after a few seconds. I had this pop up yesterday (like normal) when I began playing. Yet when I loaded it up this morning, this didn’t pop up and it just took me straight to the main menu and I could still see my last carnage report from yesterday.

So my question is, how often does Halo 5 sync data pop up come up? I thought it was every time the game was started.