Magene indoor trainer T200 Accuracy

I have used jetblack volt for a few years, using magene crank based pm since it launched in India( almost two years) perfect matching numbers.

Bought magene t200 a few months back even after calibration my crank shows 8-20 watts higher depending on my wattage

That day at a 5 min test between two my power diff was 254 vs 269 average

At 140 watts the diff is 8-9 watts.

There was a time where my magene trainer was matching with my pm in a differance of 2-3 watts which is very great.

Anyone facing similar issues?

Yes everything is calibrated.