# Homey Pro (2026): Zigbee and Thread suddenly can’t send, works 1–2 min after boot, then stops **URL:** \ **Category:** Questions & Help\ **Created:** [November 5, 2026, 4:33pm UTC](https://community.homey.app/t/homey-pro-2026-zigbee-and-thread-suddenly-can-t-send-works-1-2-min-after-boot-then-stops/161814 "2026-11-05T16:33:35Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Freddie2](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/freddie2/32/56748_2.png) [@Freddie2](https://community.homey.app/u/Freddie2)\ **Post date:** [November 5, 2026, 4:33pm UTC](https://community.homey.app/t/homey-pro-2026-zigbee-and-thread-suddenly-can-t-send-works-1-2-min-after-boot-then-stops/161814/1 "2026-11-05T16:33:35Z")
Hi all, Since today (5 Nov) around 15:20 CET my Homey Pro (2026), firmware 13.5.3, can barely transmit on Zigbee or Thread. Everything had been running fine for weeks. **Symptoms** - Almost all commands from Homey to Zigbee devices (IKEA, Sonoff, Eglo, Sunricher, Philips) and to Matter-over-Thread devices (IKEA GRILLPLATS/KAJPLATS etc.) time out or fail with “device unreachable”. This includes a Thread plug 2 m from Homey. - Incoming traffic partly works: sensor reports and Hue dimmer presses still arrive, but commands back out do not. - Right after every boot, things work for 1–2 minutes, then stop. After that only short random windows where a few commands get through. - Zigbee and Thread both report “ready”, no errors. Z-Wave is fine. - The Homey process shows high CPU (often 50–90%) and memory going 600–700 MB. **What I’ve tried (no change)** - Reboot, cold boot (unplugged 30 s), and cutting power to the whole house via the main breaker (twice) - Router reboot; 2.4 GHz Wi-Fi locked to channel 1 (Zigbee/Thread are on channel 20) - Running Homey without Ethernet - Disabling my own apps, the IKEA app, and the flows changed today - Unplugging the devices added today (an IKEA GRILLPLATS and a Telldus Z-Wave plug), removing 8 IKEA GU10 bulbs, and pulling the batteries from the Hue dimmers I used when it started - Unplugging all 4 Google Nest Hubs (they have their own Thread network) I tested once with Homey moved to another room. Zigbee seemed to work there, but it may just have been the window right after boot. **Setup:** ~76 Zigbee nodes, 69 Matter/Thread nodes (mostly IKEA), a few Z-Wave devices. Has anyone seen this? Any idea what could make Zigbee and Thread stop transmitting at the same time, and keep failing through full power cycles? A support ticket with a diagnostic report has been sent to Athom. Thanks! ---
**Author:** ![Mike\_Nono](https://avatars.discourse-cdn.com/v4/letter/m/7feea3/32.png) [@Mike\_Nono](https://community.homey.app/u/Mike_Nono)\ **Post date:** [November 5, 2026, 5:04pm UTC](https://community.homey.app/t/homey-pro-2026-zigbee-and-thread-suddenly-can-t-send-works-1-2-min-after-boot-then-stops/161814/2 "2026-11-05T17:04:58Z")
Hi. Well the thread and zigbee is using the same chip, so it could be failing. But try this app to check your thread/zigbee. I guess you have checked that the homey is fully online, and you can e.g ping it and access it and so on? Connecting using wifi/ethernet, or maybe both at the same time? For me i could not use wifi and ethernet at the same time > [@\[APP\]\[Pro\] Network Visualizer - See how your devices really reach each other, and where the signal struggles](https://community.homey.app/t/app-pro-network-visualizer-see-how-your-devices-really-reach-each-other-and-where-the-signal-struggles/159739): > > I’ve made an App to visualize the different Homey networks, Zigbee, Thread/Matter and Z-wave. This app is live on the App Store: This app was named Zigbee Network Visualizer before, but I´ve renamed it as it now supports the other network types as well. You should delete Zigbee Network Visualizer and install Network Visualizer to get further updates of the app. ---
**Author:** ![4x4\_Pete](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/4x4_pete/32/113286_2.png) [@4x4\_Pete](https://community.homey.app/u/4x4_Pete)\ **Post date:** [November 5, 2026, 10:52pm UTC](https://community.homey.app/t/homey-pro-2026-zigbee-and-thread-suddenly-can-t-send-works-1-2-min-after-boot-then-stops/161814/3 "2026-11-05T22:52:09Z")
Definitely open a ticket with Athom support! You will most likely learn from them, that your network is at fault. But you never know if they didn´t change “support” strategy unless you try. ---
**Author:** ![Mike\_Nono](https://avatars.discourse-cdn.com/v4/letter/m/7feea3/32.png) [@Mike\_Nono](https://community.homey.app/u/Mike_Nono)\ **Post date:** [November 6, 2026, 12:04am UTC](https://community.homey.app/t/homey-pro-2026-zigbee-and-thread-suddenly-can-t-send-works-1-2-min-after-boot-then-stops/161814/4 "2026-11-06T00:04:50Z")
By the way, what’s your ip range/subnet? They (athom/Lg) did some change to it in latest fw