Tacx flux smart trainer

Hi all

I’ve been useing my tacx flux trainer for a while now and I have a strange issue that happens about 70% of the time.

My resistance seems to react in the exactly the opposite way that it should. I’ll be going up a hill and it becomes every easy. Equally as I’m going down hill I really have to push the gear I’m in.

Sometimes if I’m doing a flattish course where I would rarely change gear resistance seems to increase significantly towards the end of the ride I’m pretty sure that’s not me becoming tired.

Anyone have the same issue? Any fixes?