I think my iPhone 5 is haunted or hacked?

So, I'm kinda freaked out I'm using my phone and Siri keeps popping up when I don't even hold the home button. And it will open up like random apps if I'm doing something on the internet or if I'm like watching a YouTube video. Does anyone know what's happening?

Recommend you back up and do a factory reset. If it replicates. Your phone could be faulty. Sensor issues with the touch or input section…

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