# Kickr core - Resistance issues

**URL:** <https://forums.zwift.com/t/kickr-core-resistance-issues/551611>\
**Category:** Bugs and Support\
**Created:** [June 17, 2021, 8:02am UTC](https://forums.zwift.com/t/kickr-core-resistance-issues/551611 "2021-06-17T08:02:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Eskild\_Svendson](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/eskild_svendson/32/429108_2.png) [@Eskild\_Svendson](https://forums.zwift.com/u/Eskild_Svendson)\
**Post date:** [June 17, 2021, 8:02am UTC](https://forums.zwift.com/t/kickr-core-resistance-issues/551611/1 "2021-06-17T08:02:43Z")

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Hi all, hoping for some help 🙂

Lately I experience resistance issues with my Kickr Core and Zwift. Like, if i go along a flat part, I can feel the resistance changing randomly from light to heavy. And, I can suddenly have light resistance in hills. So it feels that my trainer doesnt’t reflect the profile of the road at all.

I have updated both Zwift and my trainer through the Wahoo app. I have performed spindown through the Wahoo app.  
See the settings in the picture, is something wrong here maybe?

 ![kickr core settings](https://global.discourse-cdn.com/gozwift/original/4X/4/d/c/4dc17a09097ecf03b201fb33f97f6e54728cedfc.jpeg)

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**Author:** ![Tom\_Hagler](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/tom_hagler/32/437449_2.png) [@Tom\_Hagler](https://forums.zwift.com/u/Tom_Hagler)\
**Post date:** [June 18, 2021, 2:38pm UTC](https://forums.zwift.com/t/kickr-core-resistance-issues/551611/2 "2021-06-18T14:38:15Z")

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> [@Eskild\_Svendson](#):
>
> dated both Zwift and my trainer through the Wahoo app. I have performed sp

had the same problem. seems to be an issue with the latest firmware. downgrading firmware solves it. meanwhile other software like rouvy is still running fine