Liquid connector alert message

Good evening, Now my iphone suddenly stopped charging when i was asleep and sent an alert saying that my liquid port is wet or lightning connector something like that i cant remember the message exactly and i didnt even let my iphone touch any water before so after a while i used my iphone again and plugged my phone into the charger and it was charging just fine then suddenly the message reappeared while i was using it the iphone was in my hand and my hand was dry,nothing was wet around it,i just got my iphone 3 weeks ago so please give me a feedback and how to fix this problem Thanks