I have an Asus RT-AC66U router that has been working fine up until several weeks ago. Since then my internet connection has been dropping at random intervals. I lose internet connectivity for between approximately 15 - 30 seconds before connectivity is restored. This problem seems to occur maybe 5 or 6 times an hour.
All devices connected to my router lose connectivity at the same time, and the majority of my devices connect to my router through Ethernet cable.
I have DSL service, with a Cat6 cable running from my router directly to a port in my office wall. I do not have a modem. My ISP is a very small amateur organization from what I can tell. They provide service for the three buildings in my apartment complex.
I have the latest firmware installed on my router, and during troubleshooting I reset my router to factory defaults and reconfigured everything. However, none of this has helped the problem. As I mentioned, everything was working fine up until recently.
I am looking for some suggestions on what may be causing this issue, and how to troubleshoot the problem.