Thanks. I contacted them. Strangely, since leaning the unit on its side to see the serial number, then replacing it, the noise has disappeared.

Archer C4000, v.3.6 (purchased 9/29 from Costco). I had a C8 AC1750 for several years that was dead silent, until it went dead. The C4000 makes this repeating low buzzing sound that lasts 4-5...

No change directly into the wall (two lights on the right momentarily. The unit does feel slightly warm though. I had previously tried it in two locations, one via a surge protector and another via a...

@Carl No -- and some of my appliances would show it if there had been (clocks, turned off). Definitely not between 9:50 and 11:15 am this morning.

Have cable and router is between cable box and Win 10 desktop computer. Used iPad for a couple of hours earlier today, came back an hour later and couldn't get iPad connection to router. Here's what...