Power output less around 30Watts

Hi, i have problem with power outputs, it is lowered for around 30 -40watts, the problem started around month ago after i did calibration, i have newest software, both on macbook (latest macos app) and on the trainer (latest trainer software), i’ve also tried to plug off the trainer and plug in in the next day, nothing helps, is there anything more i can do? Has anyone similiar problem? I’ve also run the game on the phone and it is the same, so this sounds like a trainer issue. I am sure about lower power since i have Assioma to compare, and it was ok but after one calibration it broke.

What model of trainer? Have you tested it with their app or a different 3rd party app?

Oh, forgot to mention it is Zwift HUB