@Kevin_Z 

1. What is the light status of the TD-W9970 when it goes offline?

Every light is on.I mean the wifi,Dsl and internet.

The thing is it never stops working.

Thing is say 4 devices are connected.When a 5th device tries to connect the wifi wont even show up and this is random.Now if i shut down one of the 4 devices then this device maynot reconnect when switched back on.The internet would still work on the other devices already connected to the wifi.

The only way out.Restart modem.

@sand87 Hi.

The same issue with my w9970. I've eigth devices connected on wireless network (one LG Smart TV, one Chromecast dongle in other tv, one tablet Samsung T705 and five smartphones (Redmi 5A, Redmi 7, Redmi Note 7, Mi 9T, iPhone 6S; eventually and old Blackberry device). I've asssigned fixed DHCP for these devices.

I bought this modem/router a month ago (January 2020). And, I've noticed that a few days devices lost wireless connection (all or most of them) but you can see the available network by search the wireless networks on devices. I must restart the w9970 to be re-registered on the network.

Firware version: 0.9.1.0.2 v0076.0 Build 170919 Rel.61201n

Hardware version: TD-W9970 v2.

@Kevin_Z 

The same issue with my w9970. I've eigth devices connected on wireless network: a LG Smart TV, a Chromecast dongle in other tv, one tablet Samsung T705 and five smartphones (Redmi 5A, Redmi 8, Redmi Note 7, Mi 9T, iPhone 6S; and sometimes an old Blackberry device). I've asssigned fixed DHCP for these devices.

I bought this modem/router a month ago (January 2020). And, I've noticed that a few days, devices lost wireless connection (all or most of them) but you can see the available network by search the wireless networks on devices. I must restart the w9970 to be re-registered on the network.

Firware version: 0.9.1.0.2 v0076.0 Build 170919 Rel.61201n

Hardware version: TD-W9970 v2.

@Kevin_Z 

I have the same issue as well. I have four machines attached via ethernet and multiple devices on WIFI.

The cabled ones are rock solid, never miss a beat but the Wifi drops constantly, AP disappears and re-appears. When the Wifi is down the cabled ones still have internet access

I have changed the channels with no luck

Some machines lose DHCP settings but even changing all to Fixed IP makes no difference

Lights on front panel do not change

Quick reboot and all is well again

@Kevin_Z Hi. I've found that cause this issue in this módem-róuter, I think. But, Anybody is here to talk about it?

@sand87 Have you upddate te the firmware to last version? Download for TD-W9970 V2

A new firmware is available launch in March 2020:

I've updated to last firmware version for RD W9970 V2.

But, the issue remains.

And, I think I know what might be the problem. It has to do with the uploads or charges that are made wirelessly. But, I need confirm it

Kevin_Z wrote

@sand87 

Sorry to hear that the replacement does not work properly, we will do some troubleshooting to locate this issue and try to fix it.

 

1. What is the light status of the TD-W9970 when it goes offline? All the lights are on: Power, DSL, internet, wireless and LAN1 are solid and greenish LED

 

2. With your computer or smart phone connected to it at that time, what is the IP address and default gateway it obtained?
Note: How to get them: https://www.tp-link.com/support/faq/838/ Both, the desktop computer and the different mobile devices (cell phones, tablets, smart TVs, Chromecast, laptops) have different IPs assigned. I have assigned statics IPs to each of them (DHCP address reservation). The desktop computer is connected via cable to the LAN1 port of the modem.

 

 

3. Meanwhile, please try to access the web page and take a snapshot of the status page when TD-W9970 stops working. 
Note: How to login to the web interface: https://www.tp-link.com/support/faq/114/

 

4. Have you ever tried to change the wireless settings to improve the performance? Like wireless channel and channel width? Yes. I've tried change wireless channel, enable and disable SSID broadcast (main and guest network)

 

Have a nice day.
 

@Kevin_Z I am experiencing the same problems with dropped connections via WiFi. And, I think, I have found the problem. 

I have noticed that when several devices connected via Wi-Fi start to upload something (WhatsApp backups, iCloud backups upload photos and videos to Google Photos, even when speedtests are done [speedtest.com, fast.com]), for a moment the internet connection is lost, the connection it is deteriorating and the router begins to remove each of the devices connected to the wireless network. Only the desktop computer remains with stable internet connection.

Another symptom that I have noticed is that, when practically all wireless devices lose the connection, we can see that the network is visible, but when we trying to connect to it, messages such as "network disabled" or "network not available" appear in case of Android devices, or "Password error; re-enter password" for iOS devices.

It seemed to me that it is a problem of the router in the way it distributes the upload bandwidth between the different wireless devices and there must be some error in the firmware programming that causes this to happen, which seems a "collapse" or "neck of bottle" that causes the error of the WiFi networks (main, or guests network; it is hidden or visible): the download speed decreases considerably and, in the end, everything is disconnected, except the LAN connections (via cable).

The only way all this can be 'fixed' is to reboot the router (turn it on and off), so that mobile devices can re-register automatically. My experience with other models of Tp Link routers has been satisfactory, except for this model, which has turned out to be a disappointment.

Could it be that Tp Link engineers can try to replicate the situations that may be causing this annoying Td W9970 modem-router error? And fix it?

I'm having the exact same problem and symptoms - it seems to drop wifi connections sporadically and only a reboot solves it for all devices. Toggling wifi off/on does not. 

Certainly any significant uploads are a significant trigger for it, downloads do not have any impact. One example trigger for me is to upload any media to Flickr from the

app on my phone.

Somtimetimes not all devices will fail on wifi, sometimes for no obvious reason one or two may continue whilst everything else is knocked out. Seems random. 

The device reports no firmware update is available but I checked the site manually and there is one:

https://www.tp-link.com/uk/support/download/td-w9970/#Firmware

but it relates to a specific issue: "Fix the bug of CWMP vulnerability." which I think is to with WAN management of settings by remote ISP. 

I've the v3 and i'm on  Build 190419 Rel.34272n

Have to say I'm quite disapointed with this device - I realise it wasn't the cheapest but I bought at the start of covid19 lockdown and shops were closing up, so I didn't have much to deliberate over chosing the best option.

Also the manual/online-help for the device is poor as well, I understand more than probably most people due to being an Sysadmin by profession,

but anything beyond the very basic "getting connected" is very poor user interface and poorly documented. 
Take for example denying some specific devices by MAC address - you have to set the rule default to deny and then enable those devices. Slightly confusing logic!

The parental controls and QoS settings are user interface mess as well. I thought things would be better over telnet for someone like me,

but the command line interface is extremely limited and most functionality is sadly via the html interface only.

I read elsewhere that others on the forum have RMA the device and received a replacement with the exact same issue. I may just try and return this device if possible to the
retailer I bought it from, failing that I might buy an additional wifi AP and not use the onboard wifi at all. 

Hopefully a firmware will appear that will solve this however. 

@gsmitheidw