Just play in the Casino for a while, and a prompt asking you to confirm you are still there by pressing a key should appear, rewarding you with some credits. However, it has not been appearing for me. Instead, I simply get kicked out, and I receive a notification saying that I failed the prompt.
Have a similar case involving the AFK kick, but it happens almost immediately when I try sitting in on a Wheel of Money machine. I lost a bunch of Units because of this.
We are working on a fix for this, which should be out by today.
The fix for this was deployed today.