Hi,

It might be that the LED optical output from the source (TV) is a bit weak and isn't quite up to the job for the G68. Similarly, it may be that the 'tolerances' on the 568 are a bit wider and it was OK with the 'weaker' input.

You may find that the same cable is OK with another source.

Brian

Main: G65, MD600 Sooloos, MC200 Roon Core, MS600, 210, 218, UHD722, DSP5200SE, DSP5200HCSE, M6 & DSW.2
System 2: AC200 MS200, WiiM Pro+, M6.
Other: DSP5000 (96/24v1), DSP3300.