Hi, the problem is solved. The problem was in the Tacx Flux 2 hardware.
When replacing the belt, I made a mistake in the assembly, which led to damage to the magnets - the bar was bent and some magnets came off. I straightened the bar with a hammer and glued the magnets back. An important point for those who will have a similar problem - the magnets must be arranged alternately (polarity North-South-North-South, etc.) I used the compass to definite the polarity.
