Microsoft Teams Kills all Network Connectivity During Calls
Despite having a good WiFi or Ethernet connection, regardless of which network I'm on, if I join a Microsoft Teams call, all network connectivity stops working and teams simultaneously reports poor call quality and no network connectivity. All this while on an active call which I can see and hear. Here's a full description of symptoms.
Every time I connect to a Teams meeting:
- Incoming call quality is ok. I can hear and see others.
- Outgoing call quality is very poor. Others say my voice is breaking up.
- If I unmute and speak for more than a few seconds, I am booted from the call.
- If I stay muted I can stay on the call indefinitely.
I can share my screen just fine, I don't get kicked from the call.
- Teams periodically puts up a warning symbol in the call controls reporting poor connectivity.
- Teams puts up a blue banner stating that I have been disconnected from the internet.
(Intermittent) Teams puts up a big overlay on top of the whole app saying I have been disconnected
- The call continues though all of this, including voice and video.
- All other network connectivity is broken (e.g.: Browsers cannot load pages, network drives stop working)
- Text chat features work fine outside calls but not during calls, where they fail to work like all other network activity)
- The instant the meeting ends, all the symptoms stop. I can access network resources again.
My wifi connection is fine. I've tested using wired networking and encounter the exact same issue. I've also tried various audio devices and disconnecting all peripherals as longshot solutions. No dice. I don't have anything weird on my system as far as I am aware. Teams works fine on other machines but not on my primary laptop.
This issue not only makes Microsoft Teams itself nearly unusable, it knocks my whole system offline for the duration of the call, which is incredibly frustrating.
I'm booting into Windows 10 on a 2015 MacBook Pro 13". I have all the latest patches for everything. Teams Version 1.2.00.26774 (64-bit)
I've tried clearing the %appdata%\Microsoft\teams folder. I found no change to the issues I am having. After joining a meeting I was greeted with a "No internet connectivity" banner and a warning symbol in my call controls panel.
I ran the Skype for Business Network Assessment Tool. It found no issues:
C:\Program Files (x86)\Microsoft Skype for Business Network Assessment Tool>networkassessmenttool.exe /connectivitycheck
Skype for Business - Network Assessment Tool
Starting Connectivity checks
Verifications completed successfully
Web client works fine. No issues with network connectivity. I was able to place a call no problem.
I've seen two other people who have what I think is the same issue as mine, but their question threads didn't have any solutions, and now they're locked.
Does anyone have any idea what could be going wrong? Any solutions? Any more info needed from me about my setup?
Peter Broekroelofs commented
Same here on HP Spectre with Windows 10.
I was docking with a Satechi 8-1 USB-C hub with indeed a Realtek USB GbE Family Controller (automatic driver upate shows latest driver version 18-2-2016), with the same chip Matt Hull described.
After Teams dropped calls multiple times and reading this forum I returned it and changed it for another 8-1 USB-C hub from StayGo. Although it looks totally different it appears to have the same chip and driver. So no solution. And the chip used in USB-C hubs is not communicated anywhere on product specifications, so hard to choose which one doens't have the Realtek hardware and software.
When searching for newer drivers I found this site: https://www.realtek.cz/download-driver-nr-513-for-realtek-RTL8153-and-Windows10-64bit.html.
It has a driver dated August 2020! Strange that this is not found with automatic driver update. I have installed it and hope the problem is gone. Not tested yet.
Same issue here with an exec docked via USB-C (Lenovo T495 w/hybrid dock). Not good when one of the company principals drops out of several all-employee meetings in the pandemic. Swapped to a different dock that seems to have worked, I think.
Timeline was around August 2020. All research points to USB-C docks and Realtek ethernet.
Aby Mathew commented
Same issue as described above. Within minutes of me starting to speak or try to do a screen share in a Teams meeting my network disconnects. But i continue to hear others for some time . If i do a disconnect and reconnect from the Wifi , it connects again.
Happening on my Lenovo T495 on Windows 10
I have what appears to be the same issue. I can be on a Teams video call to someone in the same company and after around 20 minutes Teams will report "no internet connection" and yet I can still the see and hear the incoming video.
This seems to affect the network connection of the whole laptop.
I remove and replace the network cable and the problem is resolved, I can make a new Teams call and on we go.
It doesn't happen every time though, so I've been unable to establish a pattern. But I do know that it's local to my laptop and does not affect the network connection of any other devices on the network.
Using a Lenovo E490s with all current Windows and Office updates.
Absolutely the same thing. This started happening from sometime in August 2020. I am using a MAC with Microsoft Teams Version 1.3.00.18164. It was last updated on 27/07/2020.
Exactly the same here
Matt Hull commented
I have been dealing with this issue for months now and even worked with Microsoft support with no solution. From the information I have gathered from my system and others, it only effects laptops that are docked via USB-C and are using an Ethernet connection. It also appears to only be effecting certain models of docks that have a Realtek RTL8153 / RTL8153B Ethernet chip. The only known full proof workaround is to use an external USB-C Ethernet adapter plugged directly into your laptop.
Same, here. I have a constant ping to www.google.com and can see constant drops during conference calls. disconnect from the call. All is well and stable
See this happen - using Windows 10 on a corporate Dell PC. No indications on why this is happening. Just started happening. Unlikely to be a Wifi or router issue as it just randomly started to happen after working fine for 2-3 months. What changed suddenly? How does one debug this issue?
We have noticed in the last few days that the teams desktop app seems to cut download speed bandwidth in half. For example, we have 300/20 here but when joining a Teams call it caps to 150/20 AND calls begin to modulate. See speedtests here https://i.imgur.com/Y2RNJWl.png
I'm getting a similar issue. I have to use two O365 tenancies - let's call them mycompany and partnercompany. If I host a meeting on mycompany but I'm logged into partnercompany Teams, when the meeting starts and I try to join, I lost internet connectivity completely. I then log into mycompany on Teams and while it is waiting for a connection, I switch off WiFi and on again, then it reconnects to the internet and Teams and the meeting starts ok. It has taken me some time to realise since apps do not usually crash the comms protocols and I have been investigating my WiFi and calling my broadband provider, so this bug is a real hassle.