iPad randomly activating Siri and interrupting videos

I was wandering if Siri popping up randomly in the middle of the night talking like if someone had been talking to her is normal in an iPad. I was also wondering sometimes when I have video’s playing it randomly stops them on this iPad, and sometimes it is like someone is touching the screen when a video is playing when nothing is touching it.

[Re-Titled by Moderator]

Original Title: iPad with a Siri problem