@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...

@AlBampton_1994 One more thing: Deco E4 have 100Mbps Ethernet ports. If your Internet link is faster than 100Mbps, these are not a good choice for WiFi mesh. Your WiFi speeds will be limited by...

@AlBampton_1994 It appears they are still configured and someone else might have access to them through their Deco app. You would not want that. Here is the process how to make them your own: 1....

@Hasayeret I can think of only one reason to keep Archer router. If you can configure at new place Archer to connect to modem, but fail to do that with Main Deco. In that case, keep Archer connected...