Define the metric:

First, it's essential to understand the constituents of the customer satisfaction score. It could be based on various factors such as service quality, room quality, customer support, price, etc. Understanding what exactly contributes to this score will help me figure out where the problem might lie.

Analyze the timing:

Was the drop in customer satisfaction score sudden or gradual? If it was sudden, we might be able to associate it with a specific event or change.

Segmentation Analysis:

Breaking down the customer satisfaction score by different customer segments (e.g., demographics, customer types, room types) could give more specific insights into where the dissatisfaction is coming from.

Internal factors:

1. Investigate internal changes: Was there a change in hotel partners in Jaipur, staff changes, policy alterations, or updates to the OYO app or website? Could there have been changes in pricing strategy? Any of these could potentially affect customer satisfaction.
2. Feedback and Reviews: Analyze the feedback provided by the customers during this period. This will give more qualitative insights into why customers might be dissatisfied.
3. Coordinate with local teams: Engage with the ground operations team, customer service representatives, and hotel partners in Jaipur to get their perspective on the situation. They might have insights that aren't visible from the data alone.

External factors:

1. Examine market changes: Were there new competitors, changes in regulation, or significant events in Jaipur? These external factors could have influenced customer satisfaction.
2. Economic and Seasonal Factors: Consider if there are any economic changes or if it's a low season for tourism in Jaipur, which might be leading to cost-cutting measures affecting service quality.
3. Test and Learn: Once I have a set of hypotheses, I would devise tests to confirm them, this could involve surveys for specific customer segments, or A/B tests on the platform.
4. Develop a plan and take action: Once we understand the root cause(s), we'll need to develop an action plan to address these issues. This could involve improving app features, retraining hotel staff, revisiting pricing strategy, or anything else that our investigation suggests.
5. Monitor the changes: It's important to closely track the customer satisfaction score and other related metrics to understand if our actions are having the desired impact.