Why are you using a punch down tool? Shouldn't just the caps and figertip pressure be sufficient?

Most brands only make them 110 "compatible", but this does not mean that a 110 tool is required to terminate upon them. This also means that using the full impact mode of the tool is enough to cause the problem you are experiencing.

I know that Sprint/North Supply had a bit too much of a transition between the throat of the clip and where the copper is actually forced down with their 66 blocks. This sharp edge was enough to break the conductor. I don't know the outcome of that.

Something similar came up with their IDC jack modules. It was determined that impact termination was not required and such rapid termination caused this edge to be enough to sever the wire.

Most supply house brands don't manufacture their own products; they just use a regular off-shore manufacturer that private-brands them for them.

You weren't using CAT6 cable with 5E or lower modules, were you? Remember that CAT6 is larger than 24AWG (23.5AWG) and if so, this might be the problem.

Ed Vaughn, MBSWWYPBX