Could be your dns shitting itself. I'd recommend switching to the google dns servers:
Hit the windows key : type in network and select
click that then click the connection name, could be wifi or ethernet, doesnt matter eg:
select ip4 then click properties
if it looks like this:
change it to this (uses googles DNS servers instead) and hit okay:
if this breaks everything just change it back to automatic and call me names, but i reckon it should sort it.
May need to reboot but shouldn't need too