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Yeah I’ve hit that before, usually feels like it “learns” itself into a corner.
In a few tests it wasn’t actually bids, it was inventory drying up based on how tight the keyword + audience signals got after initial learning. Duping resets that, which is why it spikes again.
Might be worth loosening targeting slightly or layering in a broader audience just to keep it alive longer, then compare impression volume over a few days instead of day 1 vs drop off.
