Hi - hoping people find my solution useful. I have an ASUS UX32A, but am guessing that this problem is common to their Zenbooks. When the laptop is fully charged, it will say "plugged in, fully charged", unfortunately, some laptops just stop charging the battery and the light on the plug blinks red and green meaning a fault, and will never charge again. I have read in other threads that this can be fixed by uninstalling drivers and unplugging the battery, but this has to be done constantly. On my UX32A the battery went down to 4% and refused to charge at all, even when shut off. But I figured out what the problem was: it is in the BIOS settings, for USB charging when off, and allow laptop to go into low power mode when off. These settings were ENABLED on mine the day the problems started, and the problems stopped when I disabled them. So it must be a bug in the BIOS. If you have the same problem, try changing these settings in the BIOS.