My Galaxy S6 got waterlogged and started acting weird. First the power button stopped working and I forced a restart. Then the back and menu buttons became unresponsive, while the phone itself started to lag so I kept forced restarting. Sometimes the phone seemed to work well and then a few minutes later would tell me that I could not detect the SIM card. I took out the SIM card and cleaned it and used the phone in rice trick for a few hours, but now the screen is greenish and flickering for a few seconds before turning on. What should I do to fix this? All help is appreciated.