The same is actually happening to me and my friends, some of 'em are from Indonesia and Philippines.
At a certain time, every 08pm GMT+8 to 10pm or 11pm GMT+8 the game is totally unplayable for us. We checked via in-game command !ping and it showed high ping and high packet loss, rendering the game unplayable. But after 11pm GMT+8, the connection to the game is back to normal, no high ping and no packet loss and we can play again.
I once thought maybe it's the ISP just being shit randomly, but its been happening for a week to us and always at that time and been happening in different countries (Indonesia and Philippines) lol.