@nigelskw 

Hi, please help verify the below info and we will try to fix it together:
 
1. What is the current network topology? How many Deco units do you have in total and how are they connected?

2. How often do some devices lose the wireless connection? Are there some specific devices that lose the wireless connection or all wireless devices randomly have this disconnect issue? When they lose the wireless connection, do they still connected to the wireless network of the Deco or got disconnected? If they are still connected but no internet, please check whether they can still get correct IP address from the network.

3. How do you make them back to work? Do you need to reboot the Deco or it will work automatically after 10-15 minutes?
 
Good day. 

@TP-Link_Deco 

Hi, I currently have 3 Deco units working in AP mode.

Internet - Main router - Network switch - Deco
                                                              - Deco

                                                              - Deco

All Deco units are connnected via ethernet backhaul.

The disconnection is sporadic and inconsistent. Some days it is good, on other days this happens 2-3 times a day. All wireless devices (mobile phone, tablet, laptop) will lose connection temporarily (but not concurrently, so 1 or 2 will disconnect while the others are still working).
The disconnection is to the WiFi itself. The SSID will be visible but unable to connect to it automatically or manually.

After about 15 mins the devices will auto reconnect to the WiFi.

Direct ethernet connection to any of the Deco unit has no connectivity problem, so the issue is the WiFi itself.

I have used the Deco in both Router mode and Access Point mode configurations previously without issues. But after the latest firmware update this problem happens.
I have not tried Router mode after the firmware update as it is too cumbersome to reconfigure everything again on different subnets.

Thank you.

@nigelskw 

Hi, sorry to respond late.

We will contact you via email to investigate it, please check your email box and respond, thanks.

I am having this issue too with my Deco S4 setup with three units in AP mode. I have 1.4.3 firmware.

Approximatly once every two days, a red light comes up and it says the device cannot connect to the internet. However, the modem still reports being connected fine. The modem has one gigabit ethernect connection directly into the main S4.

@nigelskw I am having exactly the same issue.  I just upgraded the firmware this morning to 1.5.0 and have had the issue ever since.  I've noticed when this happens that if I try to connect my laptop via an ethernet port on the device I'm not getting a DHCP assignment with gateway.  When I unplug my cable modem from the main unit, reboot the cable modem and plug it back in everything starts working again.  I repeat - been running this system almost a year and have never had this issue until upgrading to 1.5.0.