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1/12/18
Original Poster
nonameleft1

Potential wifi drop problem caused by Google devices

Hello Google,

My Synology router that worked well before Dec 2017 however, around mid Dec all my wifi went offline at least once a day. I noticed that if I return home with my android phone my wifi usually drop connection soon after that. So I did an experiment: I turned off my two Chromecasts, four home mini and android cellphone then I no longer have router wifi drop issue. So I looked around internet forum and realized lots people having similar issues and they are have google cast devices.

I posted the forum links below(Linksys, Netgear, TP-Link and Synology) regarding similar issue and if you look at the date they are all around Dec 2017:


Some network engineers from router companies stated following: 

  • From Tp-Link: Following initial research and investigation, our Engineering Team is confident that they've determined one of the key origins of the issue. From what we have gathered so far, the issue appears to be related to some recent releases of Android OS and Google Apps. This issue stems from these devices' "Cast" feature, which sends MDNS multicast discovery packets in order to keep a live connection with Google products such as Google Home. These packets normally sent in a 20-second interval. However, we have discovered that the devices will sometimes broadcast a large amount of these packets at a very high speed in a short amount of time. This occurs when the device is awakened from the "sleep mode", and could exceed more than 100,000 packets in a short amount of time. The longer your device is in "sleep", the larger this packet burst will be. This issue may eventually cause some of router’s primary features to shut down – including wireless connectivity.

  • From Linksys: I will keep the overall description short here, but this firmware incorporates a new WLAN driver that will help mitigate an issue that was discovered where Android devices coming in and out of sleep mode would crash the Wireless Network.

Some router companies already found the solutions, however, not every router company will update their firmware to fix a potential change that made by Google. That means a lot Google customers will stuck with Google devices that they can't use at all. I am not a tech expert but from all the feedbacks and my simple experiment I can tell the wifi issue was most likely caused by Google devices.

Google could you please provide a solution to fix this issue since some router companies see this as a Google issue not their problem. Thank you
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All Replies (18)
Fiasco
1/13/18
Fiasco
Confirmed. I also have tried on my Asus Rtu-66 and although it does not totally shut the WiFi down, it does cause a period where connectivity to the internet is unavailable. Once I disconnected my Chromecast and Google Home devices, my Synology router and Asus have been rock solid.
Dorothy McNemee
1/13/18
Dorothy McNemee
We are having the same problem of our wi-fi dropping.  It comes back up rather quickly but is very annoying when on the land line or the computer.  We've had Spectrum tech support several times, on our 3rd router and even had a Spectrum tech here.  We have iphones.  We thought it was the Harmony Hub and took it back.  We love our Google Home but we really can't abide this much longer.  Does Alexa have the same problem?
bjthomas09
1/13/18
bjthomas09
Just a suggestion and not realistic for everyone given the cost, location of the device, existing wiring, and availability of switch ports.  But I was experiencing wifi going offline as well,  I also have almost 70 wifi devices 5 of which are chromecast devices.  But I grew tired of troubleshooting wireless issues and decided to wire everything in my house possible.  So I bought Ethernet adapters for all my chrome cast and fire TV devices. -  One is available directly through google at the provided link or you can google Chromecast Ethernet adapter and find other options. https://store.google.com/product/undefined 

Hopefully Google is aware of the issue and will provide a patch soon.
arnoutvos
1/13/18
arnoutvos

I did it notice too, on my home network around mid-December. I discovered that switching this to off solves the flood on device level:

https://tweakers.net/ext/f/j5FcNGyBhTFuGWCK3nl8I2xY/full.jpg

At the end of December the problem dissappeared as it appeared. Probably a Play Services update or OnePlus Open Beta 3 (Android 8).
Rich IV
1/14/18
Rich IV

A couple of issues...I have a Linksys EA7500 dual band router and I have all of my Google Cast Devices (2 Google Homes, 2 Minis, 1 Chromecast Audio, 1 Chromecast) on the 5GHz band and when I connect my Android phone's WiFi to the 5GHz band it will frequently lose the WiFi connection. However, it doesn't drop the connection when I connect it to the 2.4GHz band. As an experiment, I connected all of my Google Cast Devices to my 2.4GHz band and turned off the 5GHz band. That resulted in my phone again losing the WiFi connection. Additionally, often when I get home from work or wake up in the morning my cast devices will not be able to connect to the internet.


I recently heard about the MDNS issue caused by the Google Home Max and I am wondering if a similar issue is being caused by Google Home/Mini.

Jonathan Bialas
1/14/18
Jonathan Bialas
I have the same issue. I uninstalled the Google home app and unplugged my home mini and my WiFi has been stable.
Router: Netgear R7000 Nighthawk
Marlamin
1/14/18
Marlamin
Can confirm this issue, but I don't have issues with my router but other devices on my network instead. I'm guessing my router isn't a bottleneck in this case which causes fun issues like Chromecast audio/video getting out of sync while the Netflix app is open and needing a reboot to clear the issue. I've also noticed my HTPC (old Intel NUC) isn't pleased with the packets either and always drops a few frames during playback. I first noticed this issue (unlocking phone, get problems) early December and I tweeted about it on December 9th after I reproduced it enough times to figure out I'm not going insane. I investigated the issue on December 24th and came to the same conclusion as the Tp-Link engineer in the OP. You can see my descent into madness while figuring out the issue on Twitter here.
I've attached the Wireshark image from my final tweet here as well as I think it's a useful indicator to confirm the issue the Tp-Link engineer is talking about. I've also reported the issue to Google via feedback forms and such but haven't had a reply (not that I'm expecting one). 



Brady Shober
1/14/18
Brady Shober
I also have this issue. I have been investigating with Wireshark and have found very large numbers of MDNS requests right before the network drops. I am still in the middle of testing but my initial findings are seeming to show the issue being with my Pixel 2. Since the MDNS issue causes a build up of requests while the device is sleeping, my test involved leaving my phone sleep overnight and check the packets after turning my phone on. There were were over 8000 packets after turning on my phone within seconds before the network dropped. My current test is see what happens with the Google Home Mini disconnected and I will repeat the same test but I will not know these results until tomorrow morning. The reason I believe it is the phone however is that a quick test after disconnecting the Google Home Mini showed that the Pixel 2 made 400 MDNS requests within a second. I will post further results of my test and the full details of my issue can be found at /pixelphone/forum/AAAAb4-OgUsIunudEN3y8s
mrbe
1/15/18
mrbe
Same problems for me.  I have taken my Chromecast out of the TV, uninstalled Home from my Sony Z5 Premium, factory reset my modem, and now I can use 2.4 on my phone.  I have another modem (Netgear D7000)  that I use as a wifi router from the main modem (main modem is supplied by my internet provider); it also problems with 2.4 that haven't been resolved.
Basdejongsuper
1/15/18
Basdejongsuper
Having the same problem. The fix of arnoutvos seems to help.
7 MORE
Google user
1/15/18
Google user
I can confirm as well. I thought my old Netgear R7000 router was going bad. So I bought an upgrade (Netgear R8000P). Then it started doing the same thing and I was noticing that when a new device connects to my WiFi, it would boot everyone off. Now, I've got 25+ devices that connect when I'm at home, and finding the time to figure out which device it is is not something I have time for. I have 6 Google Home Mini's, so this now makes sense. 
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