Soft pops in one channel

SOLVED. Loose optical connection    
 

I am hearing soft but audible pops in one channel of my fully digital system. I have cleaned and secured all cable connections. When swapped R/lL ICs on my DAC and integrated the pops went from the right to left speaker. So not speaker related.
The pops also occur through my separate headphone amp which runs through DAVE. Also hear through DAVE’s internal HP connection..

Only audible on certain softer QOBUZ tracks or streamed radio tracks. Is it possibly a bad internal RCA issue with DAVE? Can’t swap with XLR as one failed and I’m using unbalanced DAC connection. (Syn Res Element Copper)

Same tracks with pops on my main system don’t pop with my CHORD MOJO or NAIM UNITI ATOM system. Or my cd player.

TIA for any input.

Pathos integrated

DAVE/Sean Jacobs external LPS/M Scaler/TPardos LPSU

Zenith MK3/PhNET/PhUSB

AUDIOWISE Galvanic Isolation

Transparent PowerIsolator

REL S/812

Tannoy Kensington