Is your CMOS battery OK?
I know if it isn't, the clock usually reads the wrong time, but you may have one that sets automatically via the internet.
If it is a bit dodgy it could cause your bios to default the bootup settings.
Just a point.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.