Hey. I experienced a similar problem and Apple was no help. I accidentally dropped my phone in the pool and grabbed it out right away. It was kind of working afterwards but the volume was glitching and there were grey lines across my screen. I powered it off and let it dry in front of the fan with the SIM card out. After 12 hours of this, my phone will turn on and constantly restart every 60 seconds on its own so for now it is just powered off. Apple support told me that it should be fine after only 5 hours of drying out, and after 12 it is still shot. Apple support also told me that it should be fine seeing as the iPhone 11 has an extra security feature for water resistance. If that is the case then this seems like a manufacturing problem to me?