If the issue returns, please see this = How to Reset Real Time Clock (RTC) to Recover Your Dell Laptop for steps to reset the RTC. Be sure to check the XPS 13 9310 drivers page and manually update to the latest BIOS. Also read the the FAQ Modern Standby. * Select the Start button, then enter settings* Select Settings--> System--> Power & battery* Select Screen and sleep* Turn Off, Automatically turn off my screen* Turn On, Automatically wake up my device when I approach [IMAGE]
I've had a recurring issue with my XPS 9310 that if the LCD turns off for whatever reason (sleep, shutdown, etc.), it won't turn back on without me holding the power button for several seconds.  This is especially weird because as soon as I try to turn on the LCD (by opening the lid or pressing the power button), the IR indicators beside the camera start flashing as though it realizes I am trying to log in. I've tried reinstalling Windows twice and it worked both times at first, but the issue came back again both times after about a week.
XPS 9310, won't wake properly after LCD turns off