ROAS falling, costs rising, ads not spending? Before you blame Andromeda or rebuild the account, work through this diagnostic: tracking, seasonality, creative fatigue, structure and signals. Includes an interactive diagnosis.
It happens to every account eventually. A campaign that ran well for months starts to slide: cost per result climbs, ROAS falls, spend stalls. The temptation is to blame the latest Meta change, often Meta Andromeda, and rebuild everything. That usually makes it worse, because rebuilding resets learning and hides the real cause.
Work through this diagnosis in order. The early steps are quick and catch the most common problems.
Self-assessment
Diagnose your Meta performance drop
Answer what you see in your account. The result points you to the section to read first.
0 of 5 answered
Step 1: Check tracking first
A surprising number of "performance drops" are reporting drops. If Meta stops receiving conversions, it stops optimising for them and reports worse results, even if real sales are fine.
- Compare conversions in Ads Manager with your shop, CRM or analytics for the same period.
- Check Events Manager for errors, falling event match quality or a drop in server events.
- Confirm the pixel and Conversions API are both firing and deduplicated.
- Look for site changes: a new checkout, form tool or consent banner can break events.
Step 2: Rule out seasonality and auction pressure
Costs on Meta follow the calendar. The run-up to Black Friday and the holidays brings many more advertisers into the auction, which raises prices for everyone. Meta also reported a 14% increase in average price per ad across its platform in Q3 2026. Compare your results with the same weeks last year, not just last month.
Step 3: Look for creative fatigue
Fatigue is the most common real cause. As the same people see the same ads, response falls. Under Andromeda, accounts with few genuinely different ads feel this faster, because all their ads reach the same people.
- Signs: rising frequency, falling click-through rate and rising cost per result on your top ads, often over several weeks.
- Fix: add new concepts, not variations. Start with the formats and personas you are missing. See creative diversification.
- Prevent it: a steady rhythm of new concepts every one to two weeks; see creative testing.
Step 4: Check for changes that reset learning
Big edits send ad sets back into learning: budget jumps of more than about 20% at once, new ad sets, changes to targeting or optimisation events, and pausing for days. If the drop started right after a round of changes, give the system a week before judging, and make future changes in smaller steps.
Step 5: Check what happens after the click
Meta's ranking models learn which ads lead to conversions. If your landing page got slower, your price changed or your form got longer, conversion rates fall, and Meta predicts lower value for your ads in future auctions, raising costs. Check page speed, conversion rate by landing page, and any recent changes. Our conversion rate optimization guide has a full checklist.
Step 6: Check your structure and signal
- Too many small ad sets that never exit learning: consolidate. See account structure.
- Narrow targeting that has exhausted its pool: test broad. See broad targeting.
- A shallow optimisation event bringing low-quality results: move to a deeper event, using the Conversions API and CRM data.
Step 7: Consider Meta-side changes
Meta does change its systems, including Andromeda's rebuild in October 2026 and generative retrieval on Facebook Feed. These usually shift which ads win rather than breaking accounts outright. If you have checked everything above and your drop lines up with an announced change, the answer is the same as for fatigue: more distinct creative, a clearer signal and patience while the system re-learns. Our Andromeda update timeline lists the dates.
What not to do
- Do not duplicate old winners to "reset" them. Near-copies are treated as the same creative.
- Do not slash and spike budgets daily. Each big change resets learning.
- Do not narrow targeting to cut costs. It usually raises costs by shrinking the pool.
- Do not judge on two days of data. Daily swings on Meta are large.
Quick quiz
Performance drop quick quiz
Four questions.
1. What should you check first when Meta results drop?
2. Frequency rising and click-through rate falling on your top ads suggests:
3. Is duplicating a fatigued winning ad a good fix?
4. Roughly what budget change at once tends to reset learning?
0 of 4 answered
Frequently asked questions
The most common causes are tracking problems, seasonal cost rises, creative fatigue, big edits that reset learning and changes after the click. Check them in that order.
Andromeda changes which ads win, and accounts with little creative variety often feel it as faster fatigue. It is rarely the only cause. Rule out tracking and seasonality first.
Common reasons are a very narrow audience, a low bid or cost cap, ads in review or rejected, a payment issue, or ads Meta does not predict will perform. Check the delivery column and account quality first.
About a week for most changes, longer for B2B where conversions are slower. Judge on real outcomes, not daily swings.
