Hi kai boon, thats for the message.
this time round, i did my own testing instead. This was done for a few days
Issues happen around 10pm onwards to 1am (until i sleep at least)
1. Router and ONT restart, speeds seems to back to normal for around 5 to 10mins, then slow again
2. Change of Auto DNS to Google public Dns. For 2 days, this seems successful. Have not encounter slowness
3. Usage of VPN. Yes i did signup vpn. This is most successful, i get stable (though slower) connection.
Websites tested. Yahoo sg news/ Gmail/ Youtube/ China websites etc
I guess i have to use vpn to connect back to Singapore in order to fix this issue.