We would like to provide additional detail surrounding the downtime which occurred on 7/19/2021

What happened?
At 4:12pm PST, the CA1 server environment experienced downtime which resulted in all QLess applications becoming temporarily inaccessible on the server.
Duration: 8 minutes.

Cause
The root cause of the outage was due to a race condition that was triggered on one of our backend servers.
This race condition is a known issue, and can be triggered by heavy transactional load or other rare circumstances.

Remediation
Upon receiving a monitoring alert notification QLess engineers restarted the service.

Prevention
QLess has initiated a complete refactoring of the affected application. The new service application will be more fault-tolerant, available and self-healing.