Hot power button? (iPhone 7)

[Paco II]

Weird experience last night. Picked up phone and noticed that the power button and immediate surrounding area was quite warm/hot. Any of you experienced that?

I knew the Wi-Fi was weak where I was, so trying something, I turned off Wi-Fi, and that area started to cool down.

Any thoughts on what caused that, and what was heating up by the power button?

 

[44267547]

Perhaps it was warm from where the battery is or it was generating heat in that area. Unless the iPhone was switching back and forth from LTE/Wifi with the poor signal.