Hi,

I have an Archer C6 v2, which I have been using since February or March this year, without any problems. However since last week or so, it is producing intermittent connection breaks. I suspect it is the router, because I don't just lose internet connection, I lose internal LAN connection to my home server as well. Each such connection break lasts for 5-10 seconds. It is somewhat annoying as I work from home office and attend a lot of online meetings.

What I noticed is that the router's status page shows usual CPU usage between 8 - 20%, memory usage is almost constantly at 34 - 35%. CPU usage sometimes spikes to 70-90%, or even 100% for a second or two and goes back down. I watched it during my last meeting, and I noticed the following, three times in a row:

1. CPU usage went to 85%, I lost connection on my meeting
2. 1 second later, CPU usage went to 100%
3. CPU usage remained at 100% for 6-7 seconds, there was no connection
4. CPU usage went down to 25%, 1 second later connection came back

After investigation I found the unknown client connected to my wireless network. After I've switched on the access control and moved that clients MAC address to the blocked devices CPU usage fell down to 4-10% and spikes did not rise higher than 50%