Thanks for all the quick replies everyone ! However I was able to just get it fixed, a new firmware version (8.7.3.36999) was just released today right after I posted this thread . I just upgraded to that from 8.7.1.36318 and so far the clicks seem to go away, fingers crossed it stays that way.
@Wheresthedug I'm not using any SPDIF connections.
@BayouTexan yes the clicks sound exactly like that. It's good to know another power supply was interfering, very useful information in case I run into this problem again in the future.