When the Surface Pro 4 or the Surface tablet are put into sleep mode for a few hours or more, they are unlikely to wake up.
The devices have to be powered back on and this means there is a risk of data corruption.
This means that anyone who has left the system with files on which they are working open, has to shift through auto-saved versions, hoping against hope that one of those will mean that work is not lost.
Searching through the Microsoft support forums one finds numerous examples of users who have been hit by the Sleep of Death bug.
One user writes, in a post headlined Sleep of Death finally bricked my Surface: "I just want people to know that if you're experiencing the "Sleep of Death" with your Surface RT, that its demise might not be far behind..."
And another wrote: "Even after the April firmware update, I am still experiencing the sleep of death on my i7 Surface Book. I have read numerous posts on Reddit and on the Answers that people are still experiencing it."
iTWire's Ray Shaw claims the issue is fixed.