I am the marketing manager in Mobilesentrix for 4 years
Answer to "My phone stops charging around 90%"First, restart your device and try..
Answer to "Need Help Finding Replacement Parts"I think should contact swagtron's official site. they may help you..
Answer to "How to fix "slide to power off" screen that randomly shows up?"I think power button is damaged from the water, you need to replace with new parts or otherwise you can manage from "AssistiveTouch" and "Home button".