PC System MB: ROG Maximus XIII Hero. CPU: Intel i9-11900K, RAM: Corsair Vengeance DDR4 32GB. GPU: Founders GF RTX 3090. SSD: Corsair Gen4 2TB. PSU: Corsair 860 AX (860w). Cooler: Corsair Hydro H100i. Just updated FS2020, the Bios, the Nvidia drivers, and Win 11 to 22H2. I suspect it to be either a PSU or a Cooler problem? The Event Viewer at time of shut down shows ‘X’ Critical - Kernal-Power’. The FS settings (buildings, water, clouds, ect.) are set to Ultra in 4K. The CPU, RAM and GPU should be able to handle these settings. Any advice Please.
Hello
I would say PSU.
But if you have several USB connected try to remove them all and try to see without them connected.
IfsPC restarting after shut down? Any way 99% of PC reboot issues are PSU related
Thanks. Yes, tried removing all USB devices (except KB and Mouse), including Saitek X52 flight controller. I have contacted Scan PC about this, waiting to hear. Almost sure it is the PSU that needs replacing.
Thanks. It shuts down and re-starts automatically. You have re-assured me that it is the PSU.
I had the same issue. Random reboots only using MSFS (not other games) especially using the FENIX. PSU was only 1.5 year old. I changed it and issue disappeared.
I’m getting the same issue. Probably will have to upgrade my PSU
The graphics settings in FS does affect the power drain. When I turn the FS graphics down to medium or high then the PC does not shut down. With a i9-11900K, RTX3090 and FS ultra settings, a 850w PSU is pushed just beyond its limits. I have spoken to Scan PCs, and they agree the PSU is more than likely causing the shutdown. As long as I am not planning any upgrades, they recommend a 1000w PSU. Cleaning all the fans, increasing fan speeds, clean off the thermal past on the CPU and apply a fresh generous coat of thermal paste. The CPU thermal paste becomes less affective over time. That should cure the PC shutdown problem.
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Hi,
Hope you doing great, so I 10000% sure is PSU as I have had same spec system except 2080 ti at that time, and my PSU was RM 850 gold it just did not like to play games as I had random restarts, they way I sorted just bought new PSU EVGA supernova 1000w gold and just enjoy my new PSU and my upgraded PC as now I run on EVGA Rtx 3090 FTW3 Ultra V2 and my cpu is OCD 5.3Ghz not to mention as per above 
my cpu is same 11900k and ram same amount 32GB 3600mhz, get new PSU and enjoy your setup
I had the same exact configuration. I swapped my corsair PSU to a same 850w rog and issue never came back. Note that a 850w should be plenty for a 3090 but sometimes PSU components can deteriorate with time ( condensers etc…)
Bought new desk wired up tower. FS kept crashing during flight. There was a drawer above tower. Even though I thought it had enough air circulation it didn’t. As dumb as it sounds I moved tower other side of desk and works great now. Hope this helps someone.
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I had this problem for a while. RAM problems can cause it, so I swapped ram, which didn’t fix it. Temps were good, so it wasn’t over heating. I put a new PSU in and the problem went away for about a year. (From 600w cooler master to a 850w EVGA G2) I decided to dig deeper and learned that the problem can also be caused from bad GPU drivers…well I constantly experience driver problems. I’ve never been able to update my [AMD] GPU drivers without it running into a error. WIN and AMD where fighting to be the one who installs it. I used DDU, as well as followed JayzTwoCents instructions on preventing windows from installing GPU drivers. Win still tries to install them tho, so I got a program from Microsoft (shared to a windows help forum) that can hide certain available updates. So far, fingers crossed, fixing the drivers seems to have solved the PC shutting down/restarting problem for me. It makes me think my other PSU might’ve been fine too.