Compliant images can still start getting suppressed after 30 days because Amazon’s checks are continuous, not one-time. Amazon regularly re-scans listings with updated algorithms, so something that passed initially can be flagged later (for example, borderline white background, low resolution, or misleading composition).
Suppression may also be triggered by non-image factors that surface later (policy updates, safety complaints, IP claims, or listing data conflicts), but the system surfaces it as an “image” or “search suppressed” issue, which confuses sellers. Technical glitches and catalog merges can also randomly drop or replace images, making a once-compliant listing suddenly appear “missing main image” and therefore suppressed.