I am looking for insights from experienced, high-volume sellers (preferably 5+ year veterans who understand advanced algorithmic behavior). Please skip the basic “lower your price” or “speed up your shipping” troubleshooting steps—I am well past those.
My Profile & Operation:
Experience: Nearly 6 years selling on Amazon.
Model: Cross-Border FBM (shipping directly from our US-based warehouse to European/Global marketplaces).
Listing Advantage: I am the absolute Lowest Price (Lowest Landed) and offer the Fastest Shipping Time on over 95% of my active listings. There are NO FBA competitors on these specific ASINs.
The Crisis (As shown in the attached screenshots): Exactly 3 days ago (starting around May 21st), my global sales took a catastrophic nosedive toward zero. Looking at my Featured Offer % Breakdown, it is clear that this is a simultaneous, account-wide global suppression across almost all my major European marketplaces:
Germany: Crashed from 51% to 17%
France: Crashed from 51% to 25%
Poland: Crashed from 54% to 12%
Spain: Crashed from 31% to 19%
The Anomaly: We all know the Buy Box algorithm is designed to rotate past the top sellers, especially if you hold the lowest price and perfect metrics. Dropping to a near-zero rotation for 3 consecutive days across multiple continents—while maintaining the absolute price and speed advantage—is mathematically impossible under normal conditions.
Interestingly, a few weeks ago we fought a single-marketplace suppression on Italy through Seller Support escalations, and our Italy/Netherlands share actually went up slightly during this global crash, while all un-touched marketplaces were severely throttled.
My Theories:
Velocity Throttling (Hidden Account-Level Velocity Limit): We had a massive sales spike around May 16th (as seen on the graph). I suspect Amazon’s risk mitigation bots triggered a silent throttle on our Seller ID to wait for yoldaki (on-the-way) shipments to register as “Delivered.”
Pre-Memorial Day Pad Time: Since we ship from the US, is the algorithm silently adding massive “buffer days” to our cross-border delivery promises ahead of the US holiday, knocking us out of the backend rotation algorithm?
Has any veteran cross-border FBM seller experienced this type of sudden, multi-marketplace algorithmic “shadowban” right after a sales peak? How long did it take for the velocity limit to lift, and did you have to force a backend refresh through internal teams, or just wait out the tracking deliveries?
Looking forward to high-level technical discussions only.
So, what you are describing does sound more like an account-level Buy Box suppression or trust-score issue rather than a normal pricing or metrics problem, especially if the suppression is global, rotation is effectively zero, and your account metrics are genuinely flawless. There have been multiple reports from experienced FBM sellers of sudden account-wide Buy Box loss affecting entire catalogs despite excellent performance metrics, and in some cases Amazon later confirmed it was a system-level or account-level issue rather than an ASIN-specific problem.
One thing many sellers underestimate is that Amazon’s Featured Offer system is no longer based purely on visible metrics like ODR or VTR. The algorithm also appears to factor in hidden trust signals such as marketplace risk scoring, delivery reliability by geography, external price parity, account history, cross-border shipping consistency, customer behavior, and even internal confidence in fulfillment predictability. Cross-border FBM accounts are especially vulnerable because Amazon tends to heavily prioritize delivery certainty and customer experience in each local marketplace.
The fact that you mention “0 rotation” is important because that often points away from normal competitive Buy Box fluctuation and more toward either a hidden suppression state or a marketplace confidence downgrade. In many real cases, sellers only resolved it after escalating specifically to the Buy Box or Featured Offer team rather than ordinary Seller Support, because standard support agents usually only review single ASINs and miss the account-wide pattern completely.
One thing I would strongly check is whether Amazon detects your external pricing or delivery promises as uncompetitive in any region, even indirectly. Buy Box suppression can happen globally if Amazon believes the overall customer experience is weaker than alternatives, even when metrics look perfect in Account Health. Also verify that your shipping templates, transit times, and handling times are not unintentionally aggressive for cross-border delivery realities, because Amazon increasingly penalizes perceived delivery-risk variance even before metrics visibly deteriorate.
If this were my account, I would immediately gather a list of affected ASINs, document the timing pattern, compare marketplaces where suppression occurs versus where it does not, and push for escalation specifically as an “account-wide Featured Offer suppression affecting multiple ASINs despite compliant metrics.” Sellers who treated it as isolated ASIN issues usually got nowhere, while those who framed it as a systemic account-level anomaly had a better chance of reaching the correct internal team.
