S/PDIF UNLOCK means that the processor has lost the signal coming from the coaxial digital input. There is no bitstream signal to LOCK on to.

Perhaps the Outlaw coaxial digital cable is not shielded enough from outside RF and other types of stray interferences.

You may also have your equipment hooked up to a circuit that has these items you mentioned on the same feed. This can cause interference in and of itself if the motors or ballasts are sending feedback into that circuit. You may need to consider (if that's the case) putting in a dedicated 20 amp power line just for your HT.

Dan