Digital Cracks/Pops AES 192 Digital IO - S/PDIF

[NateAlexander]

Hey all, got a troubleshooting issue that is driving me up a wall

our studio has a CDJ system hooked up through S/PDIF -> AES (Ch. 1+2) to a 192 on our HDX system, and lately it has begun to crackle and pop even when idle. another tech said he saw the Big Ben that's locking the whole rig go loco for a minute a while back while client was practicing on CDJ system.

my first thought was something happened with the clock, but every channel is fine, and the CDJ doesn't take sync anyway.

then i took a look at the SRC-- but it seems fine, the 192 is locked to the Big Ben, and the other component running through a digital to AES converter (but TOSLINK) isn't replicating this issue.

this sound to me always means something with clocking or sample rates-- any other ideas?

wondering if it's the Hosa, or just the cable, but that seems too easy...

ftr:

Mac Pro
3.3 Xeon
80 GB DDR3

2x HDX cards

2x Big Ben locking up:

1x 192
1x HD I/O