Can a hot POE Ethernet connection fry a RCM5760?

We have a customer that keeps killing Rabbit modules. We know they have POE on site. They say they aren’t using it or connecting to POE enabled ports but I have my doubts. I saw another post about POE isolation of 1,500V being a problem on another Digi board/module.With the size of the RCM760 I suspect the same holds true and there isn’t enough room to create the gaps needed for isolation.