Siri being activated randomly

I recently bout a pair of Sennheiser Adidas 685i behind the neck headphones. When I am on my run, Siri keeps randomly activating. I don't know if it these headphones since they have a mic and inline controls built in, or if it is something with the iOS. I am running the latest non-beta version. Anyone else have this problem? I have had the headphones for about 6 months and the Siri thing started up in the last month or so. I have already tried wiping the phone and that didn't help. Any ideas?
Thanks!
Macaddict16