i had the same issue as you bro unifi 30mbps
I cant even play DOTA 2 SEA server is 200+ ping but last week its fine below 100 ping

restart router same issue by the way i am using my personal router not UNIFI router same issue i did troubleshoot but same.

YOUTUBE , TORRENT , STREAMING , DOWNLOAD ETC, is fine but not in DOTA 2.

but ping sometimes is request timeout. anyone can advice how to fix this hehehe

Hi I tried different server and it was fine with me playable than SEA SERVER.

i triend EUROPE WEST AND DUBAI ping is 190-200 but playable delay 0.1secs

in SEA Server 3sec delay