Less than 1% of Amazon sellers drive almost half of all third-party sales on the platform. The gap between winners and everyone else keeps widening — and when your sales start dropping, it usually isn't because the platform is broken. It's because something specific is wrong with your account, and you can fix it.
At AMZ Advisers, we manage 52+ client accounts. When a client calls panicked about declining sales, we run through a diagnostic checklist. Nine times out of ten, the cause is one of the reasons below. Here's what I actually check, in order, and what to do about each.
1. Seasonal Slumps (Check This First)
Before you panic, check the calendar. Winter clothing dies in April. Pool floats spike in May and crater in September. School supplies peak in August. Halloween costumes tank November 1st.
Every category has a seasonal pattern. If your decline aligns with known seasonality, there's often nothing wrong — you're just living through the trough.
How to diagnose: Pull your sales data from the same week last year and two years ago. If the pattern matches, it's seasonality. If it doesn't, keep reading.
What to do:
- Run promotions or bundled discounts during your off-season
- Stock up ahead of your peak season (Prime Day, Black Friday, back-to-school — whichever hits your category)
- Add complementary year-round SKUs to smooth out revenue
2. Uncompetitive Pricing
Amazon shoppers are more price-sensitive than ever. A $2.50 difference on a $25 product — barely 10% — is enough to swing the purchase. And in 2026, with the effective Amazon take rate sitting at 34%, the pricing math is tighter than it's been.
How to diagnose: Open your listing as a customer. Check the price vs. competitors selling the same or similar product. If you're 5%+ higher and they have comparable ratings, that's your problem.
What to do:
- Use a repricer. Amazon's built-in Automate Pricing works for basics; third-party tools like RepricerExpress, Aura, or Feedvisor give you rule-based control (protect your floor margin, only compete with sellers above a certain rating)
- Follow Amazon's Marketplace Fair Pricing Policy — pricing your own product cheaper on your DTC site or TikTok Shop will get your Amazon listing suppressed
- Don't chase the bottom. Factor in all costs — 34% to Amazon, plus ad spend, plus COGS — and hold a floor that keeps you profitable
3. Listing Hijacking
If you're a private label seller and your Buy Box share suddenly collapsed, a hijacker might be on your listing. This happens constantly — counterfeit sellers piggyback on your ASIN, undercut you, and steal your Buy Box while diluting your reviews with bad product.
Signs you've been hijacked:
- Unauthorized sellers appear under "Other sellers on Amazon"
- Sudden spike in negative reviews mentioning quality issues
- Buy Box rotation between you and unknown sellers
- Price fluctuations you didn't trigger
What to do:
- File a Report Infringement through Amazon immediately
- Buy the counterfeit product, document it, and escalate to Amazon's Counterfeit Crimes Unit
- Register your brand in Brand Registry if you haven't — this is non-negotiable
- Enroll in Transparency and Project Zero if available for your category
4. Inventory Mismanagement
Stockouts kill sales twice. First, you lose the direct revenue while you're out. Second, Amazon's algorithm deprioritizes listings that go inactive — even after you restock, your ranking has dropped and takes weeks to recover.
How to diagnose: Check your Inventory Performance Index (IPI) in Seller Central. Below 400 means Amazon thinks you're managing inventory poorly — storage limits and restock restrictions follow.
What to do:
- Use inventory forecasting tools or, honestly, a competent operator. Spreadsheet forecasts work fine if someone's actually maintaining them
- Set up automated restock alerts at 60 days of cover
- Keep a buffer on bestsellers — 2-3 weeks extra beyond your normal reorder trigger
- Monitor your IPI score and protect it — Amazon flags accounts below 400
5. Buy Box Loss
Losing the Buy Box is the silent killer. Your listing still shows up, but customers have to click through an extra step ("See All Buying Options") to buy from you. Most don't.
On a typical ASIN, losing the Buy Box drops conversion by 60-80%.
How to diagnose: Open your listing as a customer. If another seller is in the Buy Box (or if the "Add to Cart" button is missing entirely), that's your issue.
What to do:
- Fix whatever metric caused the loss: ODR under 1%, OTDR above 97%, late shipment rate below 4%
- If you're FBM, consider switching to FBA for the eligibility boost
- Keep stock levels healthy (Amazon favors sellers with adequate supply)
I wrote a full breakdown of the Buy Box rules for 2026 — read it if this is your diagnosis.
6. Expired Discounts and Campaigns
Sometimes the answer is boring. Your 20% off coupon expired last Tuesday. Your Lightning Deal finished. Your Sponsored Products campaign ran out of budget at 2am and Amazon didn't bother telling you.
Promotional lifts are real — and when they end, your baseline shows its true colors. If you were masking weak organic sales with constant promos, the crash feels worse than it is.
What to do:
- Set calendar reminders for every deal end date
- Stack promotions with overlap so there's no gap between them
- Don't rely on perpetual discounts — fix the underlying listing so you don't need them
- Check your ad campaigns weekly: budgets, bids, negative keywords, out-of-stock ASIN blockers
7. Poor Customer Reviews
One bad review landing at the top of your listing can tank conversion overnight. Especially if it mentions a recurring issue — Amazon promotes recent negative reviews prominently.
How to diagnose: Read your reviews from the last 30 days. If there's a pattern (sizing issues, defects, missing parts, etc.), that's a real problem you need to fix.
What to do:
- Use a review monitoring tool (Bindwise, FeedbackWhiz, Helium 10's tool) to get alerts on new reviews
- For legitimate issues: fix the product or listing copy to set accurate expectations
- For unfair reviews: report through Amazon's process if they violate policy
- Don't buy fake reviews. Amazon's detection is very good now and the suspension risk isn't worth it
8. Falling Organic Rank for Keywords
Search rankings are where the real long-term sales damage hides. If you were ranking #3 for your main keyword and drop to #15, your sales will crater — often before you notice the ranking change.
How to diagnose: Use Helium 10, Jungle Scout, or Seller App to track rankings on your top 5-10 keywords. If you're not tracking this, start today. Compare this week to a month ago. Falling rankings on high-volume terms is the signal.
What to do:
- Refresh your title with current high-volume keywords (use Helium 10 Magnet or the Brand Analytics search term report)
- Update backend search terms — they're free real estate that most sellers ignore
- Strengthen your A+ content with updated keyword coverage
- Drive external traffic from TikTok Shop or social — Amazon's algorithm rewards off-Amazon traffic
9. Amazon's Algorithm Changed
Amazon pushed multiple ranking updates in 2026. The big shifts:
- Review velocity matters more. Listings getting new reviews consistently outrank stale listings with more total reviews
- Conversion rate weighs heavier. If your CVR drops, your ranking drops, which drops your CVR further — a bad feedback loop
- A+ content and video are essentially required now to rank competitively in big categories
- Rufus (Amazon's AI shopping assistant) surfaces listings differently than traditional search — fresh, specific, benefit-rich copy wins
What to do:
- Refresh every listing at least every 6 months — title, bullets, backend, A+ content, images
- Test titles and main images aggressively (Manage Your Experiments)
- Add video if you haven't — listings with video convert ~20-30% better in our client data
- Write for Rufus — answer specific customer questions in your bullets and A+
Where to Start When Sales Drop
When a client calls us about a sales decline, here's the order we actually check things:
- Is the account healthy? Performance → Account Health in Seller Central. Any violations?
- Do I still own the Buy Box? Check every top ASIN as a logged-out customer
- Is any listing suppressed or inactive? Inventory → Manage Inventory → filter to suppressed
- Did I run out of stock anywhere recently? Look at the last 30 days
- Did any promotion or PPC campaign end? Check the calendar
- Has the keyword ranking dropped? Helium 10 or similar
- Any new negative reviews? Check the last 30 days
- Is there a hijacker? Check the "other sellers" section
- What's the seasonal baseline? Compare to same week last year
Most sales drops trace back to one of these in under 30 minutes of investigation.
The Bottom Line
Temporary dips are part of selling on Amazon. A two-week decline during off-season is normal. A three-week decline with no seasonal explanation is a problem — and the longer you wait, the harder it is to recover ranking.
If you've run through the list and still can't figure out why your sales are down, run an audit with us. We'll pinpoint the root cause in 48 hours.
