My wife and I have Apple Watches (she an S2 me an S3 but had an S2) and my wife and I have a shared Reminders List "Grocery". For the past few years we've been able to consistently say "Hey Siri, add <item> to my Grocery List" on the watch with NO issues. It worked flawlessly. Then about 2 weeks ago mine started behaving weirdly. All of a sudden, Siri responds with "You don't have a Grocery List, do you want me to create it on the iPhone?". If I say "Continue on iPhone", it's created on the iPhone. But here's the strange part. If I say on the watch "Hey Siri, what's on my Grocery List?", it responds with my list so it obviously knows it's there. Now I thought it was because maybe I was on iOS12 but then just now my wife (iOS 11.4.1) is having the same issue? I thought maybe it was because it's a shared list but then she created a new one on her phone and tried to use Siri and got the same results. I've tried restarting both phone and watch and "Resetting Sync" data. I've done a few Google Searches and the only responses seem to be "it went away on its own".