Win 10 pro, Dell ls322x, i7, 8gb ram, 80gb msata, HD4000
Strange one for me this.
was running great on 1080, then after 30+mins of browsing, res dropped to 768
display settings shows 768 (recommended settings) and won't let me switch up to 1080
I can attach my monitor for extended display and that's 1080
updated bios from A06 to A10, no change
updated driver for video and chipset, no change

Any ideas please?