Study the traffic in Wireshark, and also sniff upstream of your router to compare. I'd bet it's your router before I'd bet it's your isp. I gave up with cots r

Study the traffic in Wireshark, and also sniff upstream of your router to compare. I'd bet it's your router before I'd bet it's your isp. I gave up with cots routers a while back, and life has been significantly improved. I wrote it up here https://res.rag.pub/2020-11-1-an-home-router.html https://res.rag.pub/2020-11-1-an-home-router.html