I've been looking at the Asus forums for this issue but imo this isn't hardware based.
1. Your Microsoft user account is called "user" but that in itself isn't a problem unless it bugs you. I don't recommend changing the name on a working Microsoft account because items stored in onedrive and the store can become locked. If it does bug you then a fresh install of windows with a different default name (
but the same Microsoft email account) is the safest option.
2. I believe the power issue you have is related and will answer it here… I suspect what probably happened is;
a. After you got it back from the Asus reset it was reasonably stable and had windows 8 on it.
b. You then took advantage of Microsoft's free upgrade to 8.1 offer… more power to you.
c. However immediately after installing 8.1 you should have returned to the Asus download page for your system & grabbed at least the chipset drivers… I would personally use the Asus network, audio & power4gear driver instead of the no frills Microsoft ones for power but that’s my preference & not the end of the world.
3. I would have made a backup image at this point i.e. after installing the Asus 8.1 drivers but before adding any other programs because that is the only real way to insure a stable platform.
4. At this point you probably don't have any backup software installed and aren’t keen to reset the system again so your best bet would be to install the Asus drivers now and hope for the best… If you want to take this path then I recommend this order;
a. go to the Asus driver page and download all the drivers you want to use but don't install any just yet and don't touch anything with the word bios in it.
b. Set your system to airplane mode and disable any antivirus or resource monitoring software.
c. If you only have the default Microsoft graphics you can go to step d but otherwise Uninstall the INTEL or AMD graphics software and reboot the system… insure that any network and antivirus is still disabled after the reboot.
d. Install the Asus chipset driver first and reboot the system then install any others such as network, audio and perhaps the VGA if you want it.
e. Assuming you don't want to use the Asus VGA but instead want the INTEL one then install it now… ime the INTEL one will be better for gaming but the Asus is stable.
To be clear, I don't recommend using the bios drivers or utilities… even on a reasonably good system like this one a bios-flush is chancey.
Slightly off topic but a good backup software is totally worth investing in… get a system stable then make a copy of it really is the simplest (
read fastest and cheapest) way to fix computer issues.
p.s.
for reference the download page for your system is
https://www.asus.com/Notebooks_Ultrabooks/ASUS_ZENBOOK_UX31LA/HelpDesk_Download/