ISP: PLDT
Location: Philippines
When: Started happening after the FATE Hotfix Patch. Occurs 11pm to 4pm, and 7 to 12mn GMT +8 (Japan is +9)

I know of a lot of people who are having the exact same issue who happen to have the same ISP, I tried calling the ISP but the one who took the call only guided me into stuff that might have been the problem and couldn't find anything.