PS4 firmware 2.0 Masamune has introduced a pretty nasty problem, but happily there’s another one on the way which will hopefully fix it.
UPDATE: Sony Europe just confirmed on Twitter that firmware 2.01 is rolling out today.
PS4 software update 2.01 is rolling out today & will address issues some users have when powering on the system from Rest Mode.
— PlayStation Europe (@PlayStationEU) November 5, 2014
Original Story: Sony acknowledged general issues with the firmware update when reports first arose, but in a tweet today acknowledged the rest mode problem in particular, saying a fix is inbound.
PS4 software update v2.01 is coming soon, and will address issues some users have encountered when powering on the system from Rest Mode
— PlayStation (@PlayStation) November 5, 2014
The rest mode issue is quite serious as it requires a hard reset to recover from, which can be very risky; you may end up wiping system data or worse: bricking the console.
Best to switch your console off completely between sessions until the next firmware update; pull the plug out the wall, even, and save yourself some energy bills.