Samsung Galaxy Note 4 randomly shuts down and won’t turn on without charger

Hi. I have an issue where my phone (SM-N910C shuts down randomly and won’t turn on unless I plug to the charger or remove and put the battery back. Unfortunately it had got wet two years back and that is when the problem started. I bought a replacement battery last year which is an original one, and that worked for around 2 to 3 months, and then the problem started again. It would go to a boot loop and not turn on unless plugged to charge. I also had another battery which is not original though. I used this in it’s place and have now rooted the phone and installed a custom ROM (Havoc OS). I also tried the wakelock app but still the problem persists. It’s not as bad though. I manage to use it for a while, but there still is the fear of it shutting down suddenly. It does sometimes for slight load like installing an app. Is there a fix to this or do I have to replace some hardware. To be precise water entered the phone through the headphone jack (while taking a picture). Also the charge drain somewhat fast. Managed to type this on my Note 4 without it shutting down unexpectedly ?.