touch screen problem [android]

My phone's touch screen started acting weird since last week. When I move my finger on the screen, for example to draw a long circle, it will automatically stop my touch session midway and start to receive a new touch session, so the circle I drew will have some “holes". This become a real issue when I playing games with virtual joystick. I'm not sure if moisture is the cause since I bring my phone to shower with me regularly. Thanks for helping!