Sometimes after I start up my computer it freezes in the "press Del or F2 to enter UEFI BIOS setting" screen and doesn't react to those buttons. The backlight on the USB keyboard is lit but it doesn't seem to bee active as caps lock can't be turned on.
My motherboard is Asus P8Z77-V LK. It's stand-by led is on in the start-up but DRAM led is off. This problem has occured only when cold booting and never (yet) when restarting from Windows. I have tried running memtest and no errors were found during it.
The system is also very stable after properly booting. I updated BIOS once but it was a long ago and these problems started showing up quite recently. I have tried changing the boot order for my hard drives with no effect.
Any help would be appreciated.