Huge increase in CKErrorServerRejectedRequest / CKHTTPStatus=503 errors

Hi, My app has been receiving a huge increase in the number of CKHTTPStatus=503 errors over the past couple of months. I created a thread before, and also a Feedback (FB13300807) over a month ago, but I haven't gotten any assistance on this, and am wondering if there is any better way to get the attention of a CloudKit engineer who might be able to help.

From my users, I was able to print out the error code and error userInfo in the console: error.code == 15 (the same as CKErrorServerRejectedRequest),

UserInfo={ContainerID=<redacted>, CKHTTPStatus=503, RequestUUID=17C6B9B9-35DD-411B-8AED-7A497075D228, OperationID=5285362CCD2DDB32}}, CKHTTPStatus=503}

How can I get this issue addressed? A lot of users are reporting this issue and it's creating a big support burden.