We are also experiencing this since late January 8th 2021 (CET), from less than five up to twenty of such responses per hour. In a few cases it even results in not being able to verify receipts with newly purchased IAPs at all in a reasonable time frame, therefore killing our onboarding-purchase-flow and leading to increased user complaints (since, in contrast, the App Store / StoreKit communication is not affected, i.e. purchases generally go through). Filed a bug via feedback assistant as well. Hope to hear some news on this soon.

We are also experiencing this since late January 8th 2021 (CET), from less than five up to twenty of such responses per hour. In a few cases it even results in not being able to verify receipts with newly purchased IAPs at all in a reasonable time frame, therefore killing our onboarding-purchase-flow and leading to increased user complaints (since, in contrast, the App Store / StoreKit communication is not affected, i.e. purchases generally go through). Filed a bug via feedback assistant as well. Hope to hear some news on this soon.