My apple TV turns on by itself?

My apple TV turns on by itself and switches the source from from cable box to Apple TV. My television is on using our cable box and I am nowhere near my Siri Remote. It seems this happens when the Apple TV loads an update since I get the boot-up screen before the Apple TV interface becomes visible. That doesn't happen when I simply turn the Apple TV box on.

I am also curious if a nearby Apple remote can trigger my box. Today, my television switched to Apple TV and displayed an airplay code that appeared to have my neighbor's username.

Are these situations normal? Are they preventable?