Same problem here, ang lag talaga lalo na during peak hours. And I also believe that the problem was coming from their DNS Servers. I already signed a waiver to gain full admin access sa modem ko. Pero sadly, ayaw mabago yung DNS kahit nakalagay na dun is 1.1.1.1/1.0.0.1. Ang nadedetect ay dns parin nung SMART.
Ps. Nakakagigil