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Dp83848 damaged with poe

pablo tavolaro
Prodigy 170 points

Hi my circuit as follow

 

The circuit work properly is powered by DC IN 12V.
But sometimes when powered by Poe the DP83848 is damaged when plug the RJ-45
When DP83848 is damaged the temperature increases to 40ºC
and the impedance between GND and Vcc3 decrease to 65 ohms.
When this happen no more Ethernet connection and the link led is blinking.

If change the DP83848 the Ethernet link is established and all work fine.
What can damaging the DP83848?