This incident has been resolved.

Kaltura’s technical team has identified an issue with the load balancer clustering mechanism. While working with the load balancer vendor on this issue, it’s been identified as a bug. “Certain configuration parameters used during an SSL handshake can elicit a 'queue stuck' message, causing device queue and resulting with device instability”.
We will work on applying a fix in the nearest time possible.

We are currently investigating an issue with the upload service.