Sims 4 fullscreen mode keeps minimizing

So I actually got another Window's update and whatever changed, the problem is now completely gone. I'm guessing something in the last update was conflicting with Sims or taking priority away from the window being opened. I thank you very much for taking time to try and troubleshoot my problems since I was completely and utterly stumped. (honestly I reset my PC and it didn't fix but then I got a random update and now it's fine).

Again, thank you so much!

@Maasterash  That's great to hear, and also very useful information.  If you have time, could you look up what the update was?  You should be able to see it in the Reliability Monitor too.  I'm just curious what the exact name is so I can look up what it's supposed to fix, and also of course in case someone else has the same issue.

I ran the monitor and there are actually several updates I'm guessing since the reset erased a lot of programs and had to catch up again, so I don't really know which one exactly fixed the problem. Sorry

It seems like the stability was short-lived. The game is right back to minimizing to the taskbar and unplayable again.

@Maasterash  Please download Malwarebytes (the free version is fine):

https://www.malwarebytes.com/mwb-download

Open it, click Scan > Custom Scan > Configure Scan, check all the boxes both for scans and for your C drive (and any other if you happen to have an external plugged in), and let it do its job.  This will probably take at least an hour, so you may want to set it to run while you're doing something else.  Let me know what it finds.

Please also post a new dxdiag so I can look for any new issues.

Malwarebytes found nothing after a full scan unfortunately. I also tried the previous advice of making a new user. The game actually ran perfectly fine for a day and a half, then suddenly in the middle of playing, it started minimizing and wouldn't stop. When I ran the reliability monitor, no error specific to origin or sims showed up.
I've attached the new dxdiag for now

@Maasterash  So even when the game kept minimizing in your existing user account, it ran fine in the new account?  That strongly suggests something about your account settings.  Did you happen to change anything in the new account right before the problem showed up?  Did you change something earlier and then restart your computer right before the minimizing started, or perhaps start using another application in that account?  Anything at all that you did might be relevant.  And a change might not have taken full effect until after a restart.

I honestly did nothing with the new account other than start Sims as soon as I created it. I didn't even start with a clean boot. I played for an entire day with no problems, and pretty much resigned myself to just playing on an alternate account if that's what worked, put the computer into hibernate for the night and picked up the next day. It was running fine for several hours then in the middle of playing, the game suddenly minimized. Nothing else was open, not even origin. Then when I tried to open it from the taskbar, the problem started up all over again. Restarting the game did nothing to fix it and repair didn't either, and I didn't restart my computer.

@Maasterash  In the new account, please try disabling all notifications under Settings > System > Notifications.  Specifically do it in this order: first, turn off the notification for each individual app, then all the check boxes above the apps list, then the global setting.

If that doesn't help, please post a screenshot or two showing all the apps listed in Notifications.

Notifications are some of the first things I turn off, honestly. not a single app or browser has them on. When the game minimizes, nothing actually pops up, it's just that I can't keep it open.

@Maasterash  I'd still like to see the list of apps that would want to generate notifications if you allowed them.

Additionally, have you tried uninstalling GeForce Experience?  It would be odd for it to have this effect on Sims 4, but even with the overlay disabled, it could still be interfering.

I haven't reinstalled Experience since uninstalling and reinstalling my drivers, but I never let it optimize games I play because it wants to run them in the wrong resolution. Also whenever I play any games I try to make sure nothing at all is running because I'm always concerned about PC temps and good performance with highest possible graphics. There's not many apps on my computer that show up for notifications, and the only one I actively use, discord, is also closed whenever I play (completely shut down, not just minimized).

@Maasterash  This is kind of a long shot, but try playing with no internet connection.  You can sign into Origin and put it in offline mode, then disable wifi and/or disconnect the ethernet cable before launching Sims 4.  You should be able to open it from Origin, but in case you can't access your game library, double-clicking the .exe or its shortcut should still work.

I gave up on trying to fix it for a few days and when I went back, it's completely stable again. Other than one infinite saving screen and a crash(from a lot with too much on it from the gallery), there's no problems anymore. I have no idea what is causing this or if it will come back, but I hope not.