My phone had a motherboard issue where if it turns off it'll not turn back on when pressing power button ( the service center told me it was a motherboard issue have to change the whole thing ), but then if i wait for days and then press power button while connected to charging then it turns on , so the other day it died and i was charging it but then i heard a noise like something fell , went to check on my phone , the phone backside was covered in some oil sticky, what should i do now , i kept it far, i didn't notice any smell thou, phone isn't bulged , I didn't open the phone case cuz i was scared