So, seems to me the problem is :
Fujitsu rx + intel i350 + >esxi 6.5.0
In other situations i discovered bugs and problems in firmwares or hardware, and its very dificult to translate to fabricant....
But if every single one of us.. open a ticket.. and redirect to this post... it will help...
More information..
the problem appears one time ( only ) after restart... if i change vmnic affected and put out of vswitch. never appears again.. until i restart or the servers power off and on.
Seems to me the network card in system is unable to maintain 4 ports workings.. and randomly one of the four ports ( one diferent every time ) is affected by this use.