Hi gege,
please got to the "EyeTy T2 Lite vs. T2" thread and read there. I have the same problem but obviously hardware requirements are much higher for DVB-T2 (something the propagators found wise better not to mention), and that's why reception of in particular the ZDF channels is almost impossible. I'm afraid it's the computer to blame and not geniatech. ARD works better, maybe because they still do not work with the highest possible resolution in H.265 (only guessing).
Best, ukerm