Block mac address inter-vlan router

[Antonio de Padua Souza Mendonca]

I work with a stackable 3750G switch, I have vlan10, vlan20, vlan30, vlan40, vlan50, with its interface configured, all machines take IP from DHCP, some machines even taking IP is off the network, if I change the mac address, they will work again , another thing that happens, if you change the vlan it works again. I'm finding that certain mac addresses are getting blocked.
I already cleaned the arp and mac tables even so it stays out.
Any suggestion?

[Reza Sharifi]

Take a look at the DHCP server. Your lease time may not be long enough and that is why you see IPs dropping off the network.

HTH

[Antonio de Padua Souza Mendonca]

It is not that, in that same vlan, I have several stations working, dhcp is granting for 8 days, I did some tests, if the package does not pass through the Core 3750G I have connection, more if two machines need to communicate have trunk interface for core the communication drops . This within the same vlan, if it is a different vlan that needs to be routed it will not. The interested that I have 70 stations per vlan, all communicate, one or the other that gives this problem.