"Hey Siri" stopped working after iOS 18.3.1 update

After updating my iPhone 16 Pro to iOS 18.3.1, I can't get Siri's attention when my phone is unlocked or locked, by saying "Siri" or "Hey Siri". Those settings are still on - I haven't changed any setting. The only change is the update to iOS 18.3.1. SIGH. So much for Quality Assurance testing, I guess? Maybe Apple is letting too much automation and AI take over things too quickly. Sad, really. Siri works if I long press the lock button. I think Apple should refund us when they break things until the thing is fixed. Maybe that would incentivize them to not make so many "uh-ohs" in iOS updates. This is why people hate fast Agile updates of things. SLOW DOWN. LOL.