To uncover and understand the root causes of unexpected service disruptions, start by gathering detailed data through logs, monitoring tools, and incident reports. Use root cause analysis (RCA) techniques like the “5 Whys” or fishbone diagrams to trace the issue to its source. Involve cross-functional teams to examine system dependencies and processes. Identify patterns or anomalies through automated diagnostics and testing. Communicate with stakeholders to understand any recent changes, such as updates or configuration modifications, that might have contributed. Finally, document findings and implement corrective actions to prevent recurrence.

Gather all the information that you can through system/service logs.Try to correlate and eliminate the noise. Deep dive into the potential causes and prioritise them as per the possibility. Review and find the root cause

The “Service disruption” is so vague it can occur in any business industry.. so all the solutions will be different. Everyone that would answer this would be answering the question in their own business model exp. One size fits all approach does not work..