DA9063 Programming Question

I have a customer needing some support for their DA9063 (see below for their issues listed in order from when they first saw the issue happening to what they have uncovered)

Day 1

We are not sure if we have a mfg defect, or an order of operations issue with our programming of the PMIC.
Our first couple of batches went very well using the 232-18-A. On the last batch we had a handful of boards that would appear to latchup based on voltage applied to the TP pin. Now our programmer board appears to have TP regulator that is not working anymore. On 2 of them we measured low resistance to ground.

What possible damage to a DA9063 could happen to load the TP pin to the point where 7V output from the programming board would droop to 5V? What are the possible conditions that could cause the DA9063 to latchup?

Is there a way we can order a couple more of these cards?

I’m going to replace the regulator on the card we have and see if this fixes things.

Day 2

More information –

Steps we are following –
1.测量阻抗Vsys地面(greater than 10K) and TP pin to ground (greater than 100K) VCCIO to ground greater than 73K
2. Apply 7V to TP pin
3. Turn on USB programmer board using SCL/SDA/ground
4. Turn on our board applies VSYS and VDDIO
5. At some point with minutes, TP pin currernt limits, PMIC gets hot and after we measure low impedances from VSYS-> ground (3ohms), TP-gnd (1.6Ohms).

Any thoughts on this? Possible sequencing issues? Are we doing something wrong?
We have not had these xrayed yet.

Day 3

Appears we can talk just fine to a blank part in power commander mode and the failure occurs as soon as we try to go to OTP mode