My sponsored products ad is now spending waaaay too fast!

We’re getting a 4x ~ 5x ROAS on this adset (which is huge for our profit marign), and over the weekend til today, it’s spent by 3pm, and today it spent by 10am. Not sure what happened, we didnt edit anything. It’s an auto advertisement, not manual – so I lowered what I could, but what the heck?