Anyone else's ads fallen off a cliff since last few days of September?

Hey!

Running 3 conversion campaigns - with one being active and performing well since June. I had slightly reduced budgets by 15% across 3 campaigns but since then performance has nosedived considerably, with daily revenue and ROAS pretty much decreasing every day. Nothing else in the account has changed but some high performing creative has also turned into dud creative overnight.

Has anyone else seen such trends recently?