LG Nano 90 stutters when connected to Gustard x16

Can’t fix the stutter no matter what I try. Optical from tv to dac = stutter. HDMI extractor from ARC to coax and optical = stutter. Tried turning NOS mode on and off. IDK if it’s even really stutter but it’s like an intermittent split second cut out that happens every second or two. It’s driving me fucking insane. Could it be some kind of clock misalignment problem between the tv and dac? I’ve never had a problem like this be so stubborn and the most irritating part about it is that the bluetooth works flawlessly and has almost no lag and sounds fine and I could have lived with it if I never knew the rest didn’t work. But I do know. And I need to know why.

Please for the love of god someone help me.