use vpn...
use unifi dlink router

my issue is....my father sometimes cant receive internet connection at certain specific time. example at 10pm suddenly no internet. it can goes to night. but my one still ok... although i receive some interuption.

so whats gone wrong. what things that vpn has kacau?

No. No longer use VPN now. But it seems it has reset a lot of setting in the router . Which i dunno how to set it back to normal