ERG Mode Power Oscillations on Elite Justo with Shimano 12-Speed Di2

[misa99]

Hi everyone,

I'm having an issue with my Elite Justo in ERG mode. At low cadence (65–75 RPM), the power fluctuates by around ±30–40W instead of staying stable. This mainly happens when using the middle gears of my Shimano Ultegra Di2 R8100 12-speed drivetrain.
Subway Surfers
I've already performed multiple spindown calibrations, checked the Di2 alignment, and tested both Bluetooth and ANT+, but the problem remains.

Has anyone experienced similar ERG instability with an Elite trainer and a 12-speed drivetrain? Any suggestions or firmware settings that might help would be greatly appreciated.

Thanks!