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Yep, activates quite a bit for me, particularly when I use the word 'seriously'. I leave it on for the amusement factor to see what crazy things Siri thinks I am asking.
 
It is a useful feature but what lets it down is the random activation from other sound sources like the TV. I had the same problem on both my iPhone and iPad and had to deactivate it on both.
 
I watch a lot of news and Syria is brought up a lot, so Siri gets called on a lot by accident. I love Hey Siri, so I won't turn it off. It's not that big of a deal. Yet.
 
I am having the same issue, however it starts up when I plug in my phone and when I put on sirius radio (in my car) on the way to work.

I have "hey siri" turned off, and it still sometimes activates without provocation...

Any thoughts?
 
This happend today for the first time with me. Does the iPhone do this to get attention XD !? it May be a funny feature they added. Im on 10.3 beta 7 with the iPhone 7. And I have "Hey Siri" enabled. But siri turned on without me doing anything(i was on my desk, and my phone on the bed) and it thinks I seed "Hi Siri". So this means it wasnt the hey siri thing
 
Does anyone have the same problem?

Randomly when my iPhone 6 is on charge Siri activates saying I do not understand the question?
I have only really noticed it while I bed when my phone is charging. It could have been on charge for 10 mins or a few hours and only happens every now and again.
Worse is when I'm asleep and you here it,making me suddenly wake up!
Bruhhh it's happened to me like a min ago. My iPad was charger. Then Siri active and idk wat ur talking about
 
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