T22p occasional shocks with PoE

[james.bugden@gmail.com]

I've dozens of T22p across several locations and at one location at least two have given users mild but noticeable shocks.

All phones are powered via PoE.
The phones did not reset or otherwise indicate any power problem.
So far, the problems have only occurred at one location.

As there are no messages regarding PoE issues on this forum, or any other that I can find, I'm at a loss to understand how the shocks could occur.

Q1: Looking for any insights to this problem.

I have not tried powering phone via adapter.
Q2: If adapter and PoE are both active, which will supply the power?