Hello, same problem as flibor here. SD DVB-T2 channels are OK, HD channels are freezing after few seconds. Here is recording of broken video: Dropbox - broken-h265.ts - Simplify your life.
And here is how it looks on TV: Dropbox - IMG_1711.MOV - Simplify your life .
Same environment as flibor I guess. Orange Pi PC, Czech DVB-T2 network (we are in transition from DVB-T to DVB-T2 right now).