I suspect a loose charging port - that requires replacement. (And water damage can occur when you bring a hot (from the sun) phone into a cold environment, or the other way around. Water condensation causes water damage. And they sell these things to be used in temperature variations that we all experience winter and summer without warning us that we can destroy our phones just by going to work with the phone in a coat pocket - and they won't cover the damage. BTW, water-resistant phones get condensation damage too - it's air flow causing it, and the phones aren't airtight.)