We are experiencing a period of sporadic connectivity and webhook outages.
We are investigating this issue.
Updates will be posted to this thread, and (most immediately) on our status page: status.particle.io.
Thank you for your patience.
From the status page:
The root cause has been identified and a fix was implemented. Devices connections are stable. Webhooks and other event subscriptions have not been delivered between 11:02 AM PDT and 11:22 AM PDT. They are now being delivered normally again. We are monitoring the system for any remaining connectivity issues.