New Dell XPS 13 touch notebook computer has developed a sleep issue - it refuses to sleep, waking up instantly after putting the computer in sleep mode either via the start menu or via closing the lid. However, I cannot figure out what is waking it up.
Output of powercfg -lastwake:
Wake History Count - 1 Wake History  Wake Source Count - 0
Output of powercfg -devicequery wake_armed
Output of powercfg -waketimers
There are no active wake timers in the system
System logs also indicate that the wake source is unknown.
Hybrid sleep is disabled. Wake timers are disabled. Computer has no external wired devices connected of any kind (no external mouse, etc.). Wi-fi card wake is disabled, wi-fi card wake on magic packet and wake on pattern are also disabled in advanced settings. Teamviewer is not installed.
Any ideas on what might be going on here?
Edit: Apparently regular shutdown is also affected - it boots up again a few seconds after shutting down.
Edit again: And apparently it is working again, after changing literally nothing. What was a completely repeatable issue seems to have spontaneously corrected itself. I wonder if this could be a hardware issue that will occasionally rear its head until the motherboard is replaced. Is there anyone out there seeing a similar issue?