Bluetooth drops

Hi, I just got a new Flux S Smart T2900 on Monday. Since then I've done two races on Zwift using it, and in both races I've had the Bluetooth connection drop out with a few KM to go. Very frustrating, and I was close to throwing my bike out the window.

The firmware version is 3.3.40/1.1.6 out of the box.

I'm running Zwift on Windows, and the Zwift Companion app on my phone (all latest versions). Prior to this, I was using a Satori Smart and didn't experience this issue.

When the signal drops out, the watts readout reads -- as does cadence. Looking in the Zwift pairing screen, it still shows Tacx Flux as Connected, but NO SIGNAL. I have to unpair and pair again a few times before the signal comes back, and that takes about 2 minutes to reestablish.

I'm not running any other bluetooth devices in the home, and both my laptop and my phone are connected to my WiFi via the 5GHz spectrum.

Can someone please assist?


  • Hi, I'm having the same issue. When the connection drops, I see no signal so I unplug and replug the trainer and sometimes It works again, sometimes it does not and i'm f*cked. I also have issues with the erg mode. Sometimes it won't work even if it is enabled on zwift... I feel you when you say that you want to throw your bike out the window... I got my power unit replaced but the new one starts to do the same thing. My Gf has the exact same model and have experienced these issues only once or twice while I have issues every other ride. 
    I just read on the web people solved this issue by pairing everything but the controller using bluetooth and use ANT+ dongle to connect the controller. I will try this setup next time I ride... 
    Hope this can helps

  • Hi,

    I'm using a Flux S smart and have the same issues. The trainer was working perfectly at my girlfriends home. However, the tacx loose connection after 2-15min after starting the workout. Quite frustrating since I put all other devices out of the room, tried with an ant+ donggle. 

    I have still no idea. With my smartphone, Pixel3a, I didn't even get the bluetooth connection.

  • When Zwift is searching your devices, have you tried to connect Power and cadence using the bluetooth connection to the trainer and connect the controller using ANT+ (selecting the entry with "FE" in it's name)? Since I stated using this setup, I did not have any issue. I wish we could connect it using a wire. Wireless is so instable...

  • I tried it, but after 2minutes the signal is lost. Same as for the tacx app software. I dont get the problem. Thanks for your idea

  • Same issue here. I can barely make a connection, then it drops after 1 minute. It is not about the application (zwift or sufferfest or tacx) it is the bluetooth driver. Very frustrating, disappointed.

  • i got the same problem, i buyed a tacx ant+ dongle hopping the problem will fix with that but it doesn't make any difference, how could you keep a good training session with the device dropping every five or ten minutes?, i am very disapointed and i'm thinking to migrate to wahoo 

  • Hi, I think I could finally fix the problem. some days ago i explore the options in the Tacx Utility aplication for android and find a little advise indicating to disable the cadence/speed device option, since that i have any problem with my connection 

  • I m having the same issue with a new tacx flux s t2900

  • Having the same issue bluetooth is dropping again and again but surpisingly works perfect on my iMAC. Connection with ipad Pro and macbook pro is total garbage very frustrating. Can someone from TACX please advise? I am only using TACX videos dont use Zwift

  • Glad you found a fix... want to share what you did???????!