@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.

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.

@m_gray Till date this problem has not resolved and I'm still having the same issue despite all the suggestions given by TP Link. Have given up and continued using it as it is, most of the time it works fine. I can do with 15mins without connectivity. Doubt it will be resolved as the issue is sporadic and they are unable to locate the bug causing it.
For DHCP issues you may try assigning a static IP to each of your connected devices, if your client list is not too large. It helps for me some times.

@Simonnomis  The DECO app is not very responsive, I also find that it shows devices as connected although they are already offline, and after refreshing it is the same. Takes a while for the app to sync with the network, so I've found. But it sounds like an IP conflict issue as well, maybe you can try to assign a static IP to each of your clients instead of dynamic IP, if you do not have many devices connected to the network. TP Link has provided me a few suggestions but none have worked, so I am still living with intermittent disconnectivity a year later.

@nigelskw I can definitely confirm this issue is 100% on Deco S4.

I'm having daily random disconnections which is impacting my business badly since we are an online store.

I have 1.5.0 on my deco.

- I have 2 decos installed

- Spectrum is my provider.

We are working as normal then sudenlly the connection is gone for a few minutes. Sometimes if i dont restart the Spectrum moden, the wifi never comes back.

This is so frequent that i tested with another router (Google) and the connection was stable for 2 weeks without a single drop.

We installed back the S4 and we are seeing daily random disconnectons again.

Quite unforuante that the Amazon period to return it already expired.

Hopefully this issue can be solved ASAP.

Thanks.