API latency (1,3,7 and 15 seconds)

We are seeing intermittent slow response to our API calls that are routed through Cloudflare. I selected an API endpoint randomly and made repeated calls to test. It returned the normal response (~80ms) most of the time but approximately 1 out of 5 or so calls responds MUCH more slowly. There’s a pattern. The “MUCH” is always slightly more than 1, 3, 7 or 15 seconds. We discovered this article (https://blog.cloudflare.com/the-story-of-one-latency-spike/) which seems to be discussing a very similar pattern but talks about making configuration changes in Linux. We are a Windows shop.
We have bypassed Cloudflare, hitting our load balancer directly, and cannot recreate the issue. It only happens when we are going through Cloudflare.
Any suggestions would be greatly appreciated.

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