Sometimes after I've changed something in bios (eg. switching from pcie1 gpu to IGP) and go back things like old overclock settings will change back (default clock settings changing back to oc settings etc). Sometimes this will randomly happen after shutting down and just entering bios too. I have to do optimized defaults and change everything back. I don't know how to explain this any better, anyone ever heard of this? Things to try?
whole system = z170x gaming 3, i7 6700k, 2 x 8gb gskill ddr4 3000