For some unknown reason, the automatic firmware update did not work on my R8000P router, and I found that I was one version behind at 1.4.1.68. So I manually updated to 1.4.2.84. After the update, I found that I was having DNS problems on multiple devices. These problems persisted for weeks. I tried specifying different DNS servers, away from my ISP's servers, but the situation did not improve. So, I downgraded the firmware back to 1.4.1.68, and the DNS problems went away.
