Thank You Gentelmen,
Yes You all right about STP - its not related to STP - period. The problem looks like is with PoE but this is a nigtmare since its everywhere in 7 places including Virtual Chasis, single switch (4300, 3300, 2200) besically where port PoE is enable - does not matter if this is trunk or access port or if this is access point , phone or computer - period. I dont want to say its hardware releated but more sogtware and direction is towards Juniper. Yes its not the cable issue, that was checked.
I think I should oipen a case with Juniper since its wide related and looks like a lot of devices are invloved. Can you imagine people connected to access point and that access point flaps becasue of port ??? It diosconnects all sesions, thats the worst nightmare working in such envirmonment. I dont want to juge anything as of now since I made a too few statement, and time to call Juniper.
meybe anybody else had similar problem with PoE enabled on ports make them flaps? Once again this issue include non poe devices like computers but on the ports where poE is enabled. This is something bigger.
Thx,