sbc3820 ECZ730p2: SBC server unexpectedly closed network connection ssh and sftp

Hi

  We are experiencing problems with new SBC3820 , version nnECZ730p2.32.bz

Issue is:

1- Interface wancom0 become down and up some times.

2- Last time, other we experienced other issue : connection via ssh and sftp are closed by server.

Anyway , SBC still responding ping.

We checked connecting PC directly to wancom0 ( to discard network problems), with same results: ping is ok,  but when trying with ssh and sftp server close connection.

Connection via console is ok, and we noted unexpected result when checking interfaces :

wancom0:

     Flags: (0x1003) UP BROADCAST MULTICAST TRAILERS ARP

     Type: UNKNOWN_TYPE

     inet is: 10.39.93.4 Vlan: 0

If someone have same experience.