Music randomly stops/starts and Siri activates itself?

I have an iPhone 5, with an updated iOS and everything. Lately I'll be listening to a song with my iphone sitting on a flat surface and the song will suddenly stop itself or start skipping. Also, sometimes in the middle of the song it will stop and Siri will activate iself. I don't have "Raise to Speak" selected in the Siri settings. This just started happening randomly the other day! Has anyone had similar issues? It's very frustrating. I tried holding down the home and power buttons to do a reset, but that didn't work. I thought maybe it was just the songs I was listening to, but I tried it with other albums and podcasts and the problem persists.