when ever i've had issues with bios settings not staying remembered, it was the battery that lives on the motherboard... if its still plugged in overnight though its supposed to run off of the powersupply... maybe just change the motherboard battery on a hunch? i don't know.
Its not losing its settings. Everytime i turn the computer off for like 5 hours, it will not boot again, so i have to do the procedure i have mentioned.
I was browsing and i found more people with the very same problem, must be a DX58SO "bug".
Gonna contact Intel support.