Haven't done a fresh install of Windows 10 but did the latest Fall update, O Master. Did that back in October and no issues till just recently. The BIOS has been updated a ways back with the latest that ASUS offers.
Last evening, after I posted this, I uninstalled the latest graphics Driver from Nviidia & installed the latest driver from those folks. But actually, I updated it last week, doing the uninstall with the downloaded file and installing the latest one. Last evening, I went into the Device Manager and completely uninstalled it from there, then updated it again with this latest Nvidia driver.
I see you mention Win8.1 ... am wondering why you mention that since I'm using Windows 10, unless I didn't mention that in my first post. Anyway, if that is the reason, I'm sorry for that.
This problem of the screen jumping up and down is very random and only began a few days ago. Do you think there is a slight possibility of the Video Card beginning to go? And what is the average life expectancy of these units?
(I just noticed it again ... this time on a news website, the screen just for a quick second went weird, like distorted just a bit and it didn't jump this time but distorted to the left - went sideways for a nanosecond)