The record
An owner posted to Apple Support Community that Siri was not responding to spoken questions on a recently purchased iPhone 16 Pro running iOS 18.2. This entry records that person's experience; it does not establish how common the problem is or identify its cause. A community reply offered troubleshooting suggestions. The thread does not establish a confirmed resolution.
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A documented user report, not an independently reproduced test or an estimate of how often the problem occurs.