The iPhone XS and XS Max woes continue: In addition to cellular and wifi connectivity issues, some users are reporting charging problems with their devices — mainly when their iPhones’ screens are turned off. Here's what you can do about it.
When they go to plug their devices in to give them some juice, some users report having to first wake the screen in order to initiate charging. Others say their devices must be unlocked or have the screen lit up when the Lightning cable is first plugged in.
Users in online forums like Reddit and Macrumors have speculated about the cause and proposed a number of solutions, including enabling USB accessories in locked mode (found under Settings > Face ID & Passcode) and using Apple’s official Lightning cable instead of third-party cables.
However, the results of these suggestions are mixed. It appears that upgrading to the public beta of iOS 12.1 is the best way to eliminate the charging issue, but then you’re running potentially buggier software. You could also solve the issue by purchasing a wireless charging pad for your iPhone, but then you’re paying extra to solve what appears to be a temporary software bug, at worst.