Problems after getting wet

Hi. My phone got wet by a water jet. After that, I dried it. It works well except for two things. On the one hand, the capacitive button of recently apps doesn't work (it lights up but when I touch it, doesn't work). On the other hand, when I connect the phone to the PC, it isn't recognized and, when I disconnect it, the screen freezes and a black window with a little cross in the corner appears for a couple of seconds. What can I do? Is there a solution or I have to send it to the technical support? Thank you so much.