Veloz,
I have a similar problem with a Collings OM1A but it happens on the G string, 7th fret and only when using a capo. It does not happen when I fret the string at that position with my finger nor does it happen when I move the capo to any other position on the string. The capos I have are a G7 and a Planet Waves. I spoke to CS at Collings and he felt there could be some extremely slight variance in the fingerboard radius at that point creating the issue. He recommended switching to an Elliott Capo as the clamping action across the strings is more even. I have one on order. Think about trying that, makes sense to me. If that works let Taylor CS know about it. Surprised they did not make the same suggestion to you.
Good luck!