Amazon was hit by multiple outages from Sunday (July 12) into Monday (July 13).
Service was reportedly interrupted at its online store, and its cloud computing business - Amazon Web Services.
That's according to Downdetector, which says that more than 38,000 users indicated problems with online shopping.
Around 280 users of AWS also reported issues.
It wasn't clear what sparked the outage, but Amazon says it is now resolved.
Users had reported problems including with logging in and checking out.
Downdetector tracks outages by collating status reports from a series of sources, including error reports submitted by users.
In June Amazon reported a similar outage with platforms including Prime Video.