Attempting to stream from my PC to either of my 4K TCL Roku TVs (49" and 65") both results in the same problem. Video and sound are progressively slower and slower (sound gets deeper and deeper) until it fast forwards about every 60sec to catch up, but within 5 seconds the sound difference returns.
Win10 PC (i7, 16GB RAM, GTX 1080, M2 1TB SSD)
TVs and PC all plugged in via CAT6 to ASUS RT-AX82U
#49S405
#65S435