This is a similar issue to one posted here: Frequent DNS resolution lag. - Home Network Community

For the past 2 weeks or so, I've been facing an intermittent connectivity issue in my Deco network that occurs randomly. The DNS resolution of websites seems to sometimes take extremely long, most often ending in a connection timeout. Other times, certain devices will be able to connect to the WIFI network but receive no internet connection. I am also unable to run the Speedtest within the Deco app when the issue is occurring, as it quickly returns a failed message. During this entire time, all lights on the Decos remain green and I can see that they are well connected within the Deco app.

This issue persists even when I wire my device directly to the main Deco that is connected to my ISP's ONT, which is configured to be run in bridge mode by default. This also means that I am unable to use my Decos in AP mode.

I've verified that there is no issue on the ISP's end, as the internet connection works fine when I plug directly into the ONT.

My network consists of 2 x BE65(1.0) running the 1.1.1 Build 20250616 Rel. 12316 firmware and 2 x BE68(1.0) running on the 1.1.0 Build 20250718 Rel. 75864 firmware, with one of the BE68 being the main Deco.

Similar to the other posts, I've also attempted the following troubleshooting actions to no avail:

• Using default ISP DNS servers
• Using 8.8.8.8 / 1.1.1.1
• Testing different devices
• Testing via ethernet direct into the main Deco unit
• Deleting and creating the WIFI network from scratch

I would appreciate it if anyone could provide assistance as the Deco network has been performing nicely up until now and it's almost borderline unusable in its current state. I do have several log files saved, but I'm unsure of which parts are of relevance to include.