Dear forum,
I have the following problem: On a Kickr Core with virtual gear shifting, the watts decrease despite the same gear, the same incline and the same speed. What is the reason for this and does anyone else have similar problems? Its really annoying and difficult especially during a hard sweetspot intervall to keep the aimed watts :-(.
Thank you and best regards
Günter
Hi @Guenter,
Welcome back to Forums! I am Nelson from Zwift Support.
I reviewed your account and found that a Zwift Hub is paired with the game instead of the Wahoo KICKR CORE. I found a lot of Bluetooth disconnections from your devices, especially the Zwift Hub. This can cause the resistance and the watts displayed in the game to be inaccurate.
Please note that the usual cause for Bluetooth dropouts is wireless signal interference. Check out this article for other common reasons and tips on how to prevent this from occurring.
Don’t hesitate to contact us at Zwift Support if you need any further assistance. We will be there for you.
dear nelson, thanks a lot for your fast answer!
of course u are right - its a zwift hub…my fault 
.
Since the beginning I had the impression, that my laptop loses the BT connections. Usually I have connected:
the distance is about max. 1,5m between hub and laptop. ntl I will try to move my fan and maybe use an external BT antenna.
kr
Günter
I’ve updated my setup incl. external BLE adapter. Problem still exists. Maybe I haven’t explained it well:
Its very frustrating and mentally difficult to keep the power on the right level without ERG and its definitely not “normal”, that power decreases on a mountain (in reality). So what is wrong here?
I hope you get me right now :-).
Hi @Guenter,
Did you manage to solve this? I am having the exact same issue with a brand new Wahoo Kickr Core2 with the Zwift cog. I can’t use Zwift like this at all 
Hi Piter,
I bought an external BT antenna. It seems to be be more stable in general now. Ntl to be honest I used ERG for the 30/30s intervalls recently. But I will try this week manually and see if its working…
It is really annoying because its the opposit of “smart” - less “strenght” on the same steep, speed, cadence doesn’t make sense… and as the intervalls are already mentally hard thus makes it impossible.
kr Günter
Hi again,
still facing issues and I’m really annoyed about Zwift Cog and Click. I’ve used the flat cassette and its nearly impossible to keep a specific watt number on mountains. The changes are rapid even with the same cadence, difficulty normal or 0 same behaviour.
Maybe my expectation is wrong but one gear lower and the watt drop more than one would expect. Same in the other direction.
I regret my change of the physical cassette to Cog.
Gunter,Hello,
I have the same problem with the Neo 2T. I changed computers, from a Mac mini M4 to a Windows PC, I also tested on a tablet. I bought the Zwift Play controllers, then the zwift Click V2, and I also bought an extension cable with a USB BLE dongle placed close to the controllers and the Neo 2T trainer.
My problem: when I sprint, right after the sprint I completely lose resistance, then it comes back, then I lose resistance again for 10–15 or even 20 seconds. This can also happen on flat terrain just after changing gear. It’s horrible, and neither Zwift nor Tacx knows where it comes from or can find a solution. In fact, nobody is helping me 
We can keep in touch if you want, in case we find a solution.
Stay strong, it’s really not fun
Hi Martin, yeah thanks for your summary.
Within ERG everything is fine but when I use the “normal” mode it doesn’t feel realistic. As I descriped above: its not understandable, why the watts drop on a mountain by these size. Additionally the lower gears feel useless … then a few minutes or intervalls later its different. As the intervalls are already mentally really tough this makes it even harder. My trainer told me to prefer the gear-mode because its more like outside and also my HF is higher (esp. VO2max).
So for a free ride I think the virtual shifting is fine. But for structured, numbered related training w/o ERG its nearly useless (for me).
kr
Günter
For me, it doesn’t work in free ride and in races. In ERG mode, it’s OK.
Have you the latest firmware update? I have no issues with Neo 2, but 2T is different. I suspect a trainer hardware issue, did you test with the Tax app?
I had a hardware issue with (old) Neo 1 (2 years ago - the trainer was out of warranty for a long time) and a really good experience with Garmin chat (in Germany) - described the problem, send photos and a short video and got a refurbished Neo 2, really cheap.
yes for firmware.
For app tacx, we cant use the zwift play or zwift click, just on zwift..
Yes, you can’t test virtual shifting - but you can test if everything else is ok. I wrote a question in your other thread - English is not my native language, I am not sure if you try to use both Play and Click? I can tell nothing about click, but have absolutely no issues using virtual shifting with Play. Zwift running on a PC.