02-27-2016, 02:05 PM
I doubt that the problem is UEFI related. UEFI mostly only affects how the system boots the operating system as far as I know. This is most likely a network or server problem in my opinion. If you are not having any trouble viewing websites I would suggest switching to a different server for updates.
“I have not failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison