Joaquin, I confirm the problem with the XLX. It's not only a problem with XLX over HBlink, if you use the DMRGateway direct to XLX the same problem, audio cut off after 1-2sec. HYTERA repeaters with FW8 do it correct, repeaters with FW9 do not. Maybe HYTERA has done some changes in IPSC protocol.
As I know, the developing of gw_hytera_mmdvm is no more active and it's closed source. No way at the moment to do anything.

73 Heiko, DL1BZ