I ceased using Infinity and it's Low, Medium, High presets and switched to Sharpcap Pro for EAA largely because it offered flats/darks on the fly and other advanced features. However, Infinity is great for beginners as it is so easy and Sharpcap is comparatively difficult. So please don't view my comments as criticism of Infinity.
However, using SharpCap Pro's custom exposure/gain sliders I can remove any unwelcome banding, which I also see with my ZWO ASI294, so this issue isn't unique to the Horizon. I think it is an issue with Infinity's too narrow inflexible software presets.
So, if suffering from banding, instead use Custom Gain to find the right combination. The learning curve is steeper with custom gain settings, but I don't think there is any problem with the camera, nor with Infinity if prepared to use custom Gain.