Question

What would cause an ad that was doing well to stop performing? I had an ad getting almost 2x roas and now it’s getting 0.6 over the last couple weeks. (Only thing I changed is I slowly sclaled the budget, but it never re-entered learning phase.)

Answer 1

When a high-performing ad drops from 2x ROAS to 0.6—especially after budget scaling—several factors could be in play, even if it didn’t technically re-enter the learning phase:

Common Reasons for Sudden Drop in Ad Performance:

1) Ad Fatigue

 Your audience has seen the ad too often. CTR drops, costs rise, and conversions fall.

2) Audience Saturation

 You’ve already reached most of the high-intent users. Scaling shows ads to colder, less responsive users.

3) Competition Increased

 New advertisers or seasonal demand may be driving up CPMs in your niche.

4) Platform Algorithm Shift

 Meta may reallocate spend inefficiently after scaling, even without triggering "Learning."

5) Pixel Signal Weakness

 Lower conversions = less data = poorer optimization loop over time.

6) Tracking Gaps or iOS Impacts

 Post-iOS14, your ROAS may appear lower if some purchases aren’t tracked properly anymore.

What You Can Do:

• Rotate creatives or try fresh angles to fight fatigue.
• Segment audiences more narrowly to avoid saturation.
• Try horizontal scaling (duplicate campaigns/ad sets) instead of vertical budget increases.
• Add UTM tracking to verify performance outside Meta’s reporting.