Thank You Gentelmen,
In 4300 EX we use Junos: 14.1X53-D35.3. I work curently with Juniper Tech and we rulled out its not STP, either PoE.
Looks like we might look specifically into each category clients : phones, access points, apple tvs, computers and testing port speed sceanrios for each one. I will post updates as soon as we find anything interesting. Thank You