@ZebDub88 Second part of my recommendations from that link is to configure PC network adapter to force it on 5GHz and to make it rescan WiFi networks frequently. Have you checked if your PC has...

@konstantin_bc I do not have exact list of domains, and it could be changing with time. I would recommend to whitelist Main Deco IP address in AdGuard through Exceptions, Client List or some other...

@Pimpek This is good plan and yes, you do need WiFi mesh. That is the right replacement for separate networks of pre-mesh WiFi routers (went through that myself). Recommendations: If you have...

@konstantin_bc Main Deco uses DNS queries with set of Internet domain names for Internet connectivity health check. It is possible AdGuard automatically downloaded new version of one of its DNS...

@ZebDub88 Check my recommendations for laptop (same should work for your PC), they are simple and should be easy to implement: https://community.tp-link.com/en/home/forum/topic/672946?replyId=1375336...

@RJ88 You can connect both M4 directly to Archer, after you configured Deco mesh to run in Access Point mode: Switching a Deco to Access Point (AP) Mode Archer will not join Deco mesh, even if you...