[Bridge] Problem Forwarding Bridge to Tap Device

[Carsten <fbndd@oleco.net>]

Hello,
I have a problem with bridge and tap network where I can't find a solution 

first my scenario
 
[ETHx][PC1] <-> [Switch] <-> [PC2][ETHx][VLANx][BR0][TAP0][VBox]

Switchport of PC1 is untagged in VLANx,  Switchport of PC2 is tagged in the same VLAN. I can see the packets running as I want over all components. 

Now my Problem

I send a Ping from VBox to PC1 all works fine, while the ping is running I restart PC1, as suggested ping now fail.
After PC1 is up again packet transport should work correctly, but it doesn't  (exactly some times is ok, some times problem comes after 5th reboot or so but is coming if I have enough reboots of PC1)   .
So find the problem I dump the traffic of VLANx, BR0 and TAP0. 
What I see:
@VLANx: arp request and reply 
@ BR0: arp request and reply
@ TAP0: arp request
So I think the bridge stop forwarding packets to the TAP device and I don't understand why.  Have anyone an idea? 

Thx for help
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