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Your BIOS has automatically switched back to version F5 (formerly F31) via the Gigabyte website. You can update it directly to F31 or the newest available BIOS without any trouble. Your system is running a Ryzen 5 1600 with 16GB Corsair LPX, and the motherboard supports up to 3000mhz, though some configurations cap it at 2400 MHz.
It concerns me that it "reset" itself. That's not something that's typical of a UEFI to be capable of doing. Are you certain you had F31? If so, A flash should be possible to get yourself back up to date. As a side note, looking through the specs of your board, they do have kits validated up to 3200, but they are classified as manual overclocks.
I hadn’t saved my current bios (Rookie error). I powered on as usual, and the system reported no boot drive. I had to shut it down and unplug it several times before it restarted with a warning about a reset. After checking, it returned to F5. I only remember it being F31 since I use the Gigabyte BIOS app for updates and lighting checks.
This usually happens when the machine becomes unstable or lost its configuration, switching to default values (as shown by the "BIOS has reset, please reconfigure your settings" alert). A weak or dead CMOS battery can be the cause, or if you've been adjusting it, an unstable operating configuration or something near the stability threshold like RAM settings might trigger it. You don’t need to re-flash the BIOS if you notice that message—just understand what it means. Make sure the small watch battery on the board is functioning properly, ideally showing at least 2.9 volts minimum, but ideally around 3.0 volts or higher; a bit above is acceptable and won’t harm anything. First, load the default settings, press F10 to save and restart, then test if it boots normally without the alert before proceeding. If the battery is faulty, it won’t retain settings and will keep showing that message repeatedly. Verify the battery voltage, replace it if necessary, and once confirmed, you can reconfigure BIOS settings—though from now on they should remain stable for several years at least.
You should check the Gigabyte support page for BIOS update instructions. The link you shared shows the latest driver updates for your chipset and stability improvements. Since you're using F5 and currently have version F40, follow their recommended steps carefully. If unsure, contact Gigabyte support or a trusted tech forum for guidance to avoid damaging your system.
The only reason to update a BIOS is when issues arise. When everything runs smoothly, there’s little point—mainly because of the chance to damage the device. Updates typically address problems or introduce new capabilities, such as compatibility with newer chips or increased RAM. The Gigabyte website likely offers clear, step-by-step guidance for flashing if you need to upgrade. Avoid shutting down or resetting the system during the process; doing so can brick it. Allow the device to operate naturally and restart once it begins again. Simply use the most recent file—no need to load them all in sequence.
The system fails to detect your mouse or keyboard, requiring a restart to begin.