I have lost 500 points in 9-10 days, so nothing unusual about it. I discovered, in my case, it was the type of game that was causing the issue, closed games vs open and an inability to deal with that type of game. Upon improving my positional knowledge and skills, wild swings like 500 points in a week or so, or 400 in a few days ceased. I rarely drop more than 150 points in a week w/o recovering now. So for me it was a type of game, that required a different approach than I was prepared for. Think of it as a ratings-floor issue, something is your skill set is lacking setting you up for periodic game-collapses.
In fairness, it’s a lot easier to lose that amount in bullet or blitz than it is in rapid
... that too. Put your trust in cats.