[RT-AC5300] Loss internet connection at exactly same time everyday

I got RT-AC5300 running on merlin 384.8_2 and running FreshJR script.
I loss internet connection everyday at around 10 pm my local time(gmt+7), I am not sure this is from ISP or from my router setting because the rest of the time its working just fine.

here is the some of the log from today and it repeated everyday like this

Dec 20 22:01:01 pppd[531]: Connection terminated.
Dec 20 22:01:01 pppd[531]: Modem hangup
Dec 20 22:01:11 pppd[531]: Connected to 40:7d:0f:c2:7e:9c via interface eth0...

[RT-AC5300] Loss internet connection at exactly same time everyday