What was the glitch with Horizon?

Could you please elaborate on the recent issue with Horizon? I've heard there was a glitch that caused some disruption in the network. Can you provide more details on what exactly happened, how it impacted users, and what measures were taken to resolve the situation? Was it a technical malfunction, a security breach, or something else entirely? I'm interested in understanding the full scope of the issue and the steps taken to ensure it doesn't happen again in the future.