Just discovered this thread, scanned for a solution but didn't see anyone posting a similar issue.
Having intermittent random shutdowns, for no discernible reason. It's a launch console and I'm always extremely careful with hardware. It sits positioned atop my media console, out in the open, not tucked inside a hot cabinet where it would easily overheat. The system just started shutting off on its own, a few months, sometime after the (I think 1.10 patch). Sometimes after an hour or two of intense gaming, or within a few minutes fresh off a cold boot - it's intermittent shutdowns here all but rule out overheating. I tend to believe that since it continued to occur after several large patches, it's unlikely a result of firmware. I also replaced the stock 500GB hard drive with a 1.5TB drive, and the random shutdowns have occurred on both drives.
I'll be in the middle of a game and it will audibly beep once, then give the "PS4 is shutting down" message before turning off. rebooting gives the "you didn't shut down correctly"bootup screen.
So far, it's happened in:
Infamous: Second Son
Shadows of Mordor
GTAV
Witcher 3 and others
To date, the only temporary fix has been to rough it up a bit. I discovered this when checking the power and HDMI connections for the 15th time after a particularly frustrating afternoon where the system shut down down on me 3-4 times in a span of 15 minutes. I turned the system vertical to check the connections and let it slam back down horizontally a little rougher than intended. But it did solve the system reboots for several weeks. Till then, it has been a ritual where every 3-4 weeks or so, I need to smack up my PS4 to keep it in line. I'm thinking it must be internal but I have no idea what to even look for at this point. Rather than pay $150 to get a refurb, I'm hoping I can hold out for another year until the eventual redesign models.
Any ideas, GAF?