Don't think the bankroll is saturated; the total profit curve on the stats page is also flatlining. Yes, roll volume appears to be up, but the value of those rolls must be declining a lot. Unless they're bot bets by the house itself to make the game appear full.

Here are the last four weeks' profit:



As you can see, there was quite a large loss on the 20th June, which reduced what was 2% profit over two weeks (say ∼4% over your four weeks) to 1%. Losses happen: this is a casino. But I'm not doing RH's job for him