CRS125 VLAN File copy interrupts

Hi,

i have a strange behavior with a CRS125-15-RM.

The Configuration is simple.

3 VLANs over 1 Master Port

The Master Port get his Settings from a Monowall
Also DHCP and DNS.

Everything works well.

But if i have a file Copy from a Windows Network Share on VLAN10, and i only try to open the same share via VLAN20, the Copy process on VLAN10 interrupts.

„Problem while Access…“

Actually there are only 1 Client per VLAN, so i cant be to much stress.

I would be cool, if somebody knows to fix this.

Thank you for your time
Cheers
Voodie

CONFIG:

/export compact
# jan/02/1970 00:58:56 by RouterOS 6.28rc14
# 
#
/interface ethernet
set [ find default-name=ether9 ] master-port=ether2
set [ find default-name=ether10 ] master-port=ether2
set [ find default-name=ether11 ] master-port=ether2
/port
set 0 name=serial0
/interface ethernet switch egress-vlan-tag
add tagged-ports=ether2 vlan-id=10
add tagged-ports=ether2 vlan-id=20
add tagged-ports=ether2 vlan-id=30
/interface ethernet switch ingress-vlan-translation
add customer-vid=0 new-customer-vid=10 ports=ether9 sa-learning=yes
add customer-vid=0 new-customer-vid=20 ports=ether10 sa-learning=yes
add customer-vid=0 new-customer-vid=30 ports=ether11 sa-learning=yes
/interface ethernet switch vlan
add ports=ether2,ether9 vlan-id=10
add ports=ether2,ether10 vlan-id=20
add ports=ether2,ether12 vlan-id=30
/ip address
add address=192.168.88.1/24 interface=ether1 network=192.168.88.0

Update information:
This happens only if i access a share onthe same host.
If i connect to an other host, everything works fine, and no interrupt.