starting last night, my phone stopped holding a charge

so last night I do what I normally do, I plugged my phone in and set my alarm and went to sleep.

when I woke up it was at 100% unplugged it, got dress, go in my car and it linked up to my phone and started playing music.

30 seconds later my music stopped. I picked up my phone and it said it was too hot to do anything and needed to cool down.

it cooled down and reconnected and did the same thing over and over till I got to work. it was warm to the touch, nothing to where I couldn't hold it. maybe a lil warmer than when it gets warm when under extreme load or charging.

ive tried uninstalling all recent apps, restarting it, resetting it to factory settings, airplane mode, have looked in the diagnostics to see whats crashing.

what I do know.

my wife got her phone wet and then tried to charge it and it shorted out the cord and her charging port. she bought a new cord (wasn't an iphone one) that one also got friend. she then bought a new actual iphone cord and now her phone charges ok.

she used my cord the other day could it have possibly messed up my phone?

I have not tried to restore a backup yet but until there what do you think it could be?

thanks for the input!!