Six causes cover almost every stuck shipment, in order of frequency: missing or mismatched SABER certificates, document inconsistencies triggering a query, red-lane physical inspection, an SFDA hold running parallel to customs, unpaid duties or fees, and port congestion. The FASAH declaration status identifies which one applies.
The tracker shows where the box is; only the declaration status shows why it waits. Certificate gaps last exactly as long as you take to fix them.