I had a problem of DNS poisoning on my router + modem for a long time even though remote access was disabled and my computers were clean. The DNS entries kept

I had a problem of DNS poisoning on my router + modem for a long time even though remote access was disabled and my computers were clean. The DNS entries kept changing to bad ones (even after a factory reset). I ended up switching the modem to bridge mode and using a router of my own to resolve the problem.