The record
In a post dated November 23, 2021, a user says that for roughly 18 hours Siri answered even basic requests, like setting a reminder or asking the time, with holding phrases and then an error. They report the problem on an Apple Watch Series 7 running watchOS 8.1.1 and an iPhone 13 Pro Max running iOS 15.1.1. They tried several restarts, turning Siri and dictation off and back on, and switching between Wi-Fi and cellular, with no change. The poster wondered whether a server issue was to blame, but this is one person’s account and the cause is unconfirmed.
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A documented user report, not an independently reproduced test or an estimate of how often the problem occurs.