I noticed there are some important updates for this model.
BIOS Update January 21, 2019:
http://download.gigabyte.us/FileList/BIOS/mb_bi...
Chipset Driver Update: January 17, 2019 - make sure you install the BIOS update first.
http://download.gigabyte.us/FileList/Driver/mb_...
Please apply both of these updates to see if they help.
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.