Reply to Timecode signal!!

I've searched and searched, this is my last attempt at finding a resolution.

About a month ago I noticed that my Traktor Scratch pro 2 Timecode signals were dropping from my Mk2 vinyls and I was starting to skip. I restarted Traktor, fine for another hour then the same again. I initially though it was the decks so the next week I switched them out for another set of 1210's, an hour went by fine then it happened again.

At this point I suspected latency issues, so I raised it hour by hour, fixing it temporarily each time (got up to 26ms with issues) but eventually realised the problem must exist elsewhere. I've cut down any extra processes on my 2009 MacBook pro 13", wifi and Bluetooth off, no other program's open. I bought new vinyl, new carts, new needles..... Still there!

So next I tried a full reinstall, drivers and all, with no luck.

Could this be my audio 4 ?

Wish I had another mac to test it on!