Weird Apple TV popup

Today me and 2 of my friends were on the train and on our way home my headphones randomly disconnected and i got a apple tv pop up and i exited out and my shortly after my screen froze and it turned off i was confused and i turned my power button on and saw the apple logo than after a while my friend told me her phone also turned off and she had the same thing happen to her than the both of us were scared and confused and asked our other friend she said she had the same thing happen to her. All 3 of us got the same apple tv popup our phones froze went black than turned off. Has this happen to anyone and did we get hacked. Also btw we take tjis train like almost everyday and i have never gotten a apple tv pop up

[Re-Titled by Moderator]