Vector 3S - Right Sensor Missing

I was testing V3S that I bought and I realized that somehow power was a little to low - once back home I compared it to my Tacx Flux and difference was exactly 50% (eg 106W instead of 210W reported by Flux). Every time I pair V3S, my Edge 510 reports that 'right sensor is missing' even though I linked it in the app. Signal is mostly stable (though I do get dropouts), but I did have trouble trying to turn it on (removing and entering battery works) battery levels are good. Updating firmware is also huge issue - I constantly get "Installation failed". Can this be fixed? It just doesn't feel like the premium product I've paid for - expected it to be working perfectly.