Why has CBS's mobile app for live sports streaming experienced a spike in user complaints about buffering issues in the past week?

Introduction

The recent spike in user complaints about buffering issues on CBS's mobile app for live sports streaming is a critical problem that demands immediate attention. As we delve into this issue, we'll employ a systematic approach to identify, validate, and address the root cause while considering both short-term fixes and long-term implications for the product.

Step 1

Clarifying Questions (3 minutes)

• Looking at the timing, I'm thinking this might be related to a recent app update or infrastructure change. Has there been any significant update to the app or backend systems in the past week?

Why it matters: Recent changes often correlate with performance issues. Expected answer: Yes, there was an app update or backend change. Impact on approach: If yes, we'd focus on rollback options and change management processes.

• Considering user segments, I'm wondering if this is affecting all users equally. Are we seeing a pattern in terms of device types, operating systems, or geographical locations experiencing more buffering issues?

Why it matters: Helps narrow down potential technical or infrastructure-related causes. Expected answer: Issues are more prevalent on certain devices or in specific regions. Impact on approach: Would guide our investigation towards device-specific optimizations or regional CDN improvements.

• Given the nature of live sports, I'm curious about the correlation with specific events. Has there been a notable increase in viewership for any particular sports events coinciding with the spike in complaints?

Why it matters: Sudden traffic spikes can overwhelm systems not scaled for the load. Expected answer: Yes, there was a major sporting event with higher-than-expected viewership. Impact on approach: Would lead us to focus on scalability and load balancing solutions.

• Thinking about potential external factors, I'm wondering if there have been any reported issues with content delivery networks (CDNs) or internet service providers (ISPs) in the past week?

Why it matters: External network issues can significantly impact streaming quality. Expected answer: No major reported CDN or ISP issues. Impact on approach: If no external issues, we'd focus more on internal systems and app performance.