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Adtrans Netvanta 6355 connected to Cisco ASA 5505

Adtrans Netvanta 6355 connected to Cisco ASA 5505

(OP)
Hi there,
I'm hoping you can help me. We have a new office setup which was configured by someone else and I'm now taking over, where we have staff on our LAN with IP phones and there is also a training room which members of the public will use for training. There are 2 staff PCs and a printer directly connected to the cisco ASA for access to our network (over a VPN). These are working fine.
We also have an Adtrans Netvanta 6355 which is being used as the PBX but we also have the training room PCs connected to it and they are on a seperate subnet to the staff PCs. Phones are working fine but Training room PCs are not. It's a pretty strange situation and I'll try and describe it as best as I can.

For example, the staff network and PBX is on 10.10.10.0 and the training room PCs are on 192.168.50.0. CISCO ASA has been configured with 3 VLANs, VLAN1 = staff
VLAN2 = DSL (outside connection)
VLAN3 = Trainingroom.

Interface ethernet0/7 on the ASA is the port that physically connects to port ethernet 0/0 on the Adtrans. The interfaces on the ASA and Adtrans are configured with speed 10mb and set as full duplex. ASA int eth0/7 also has the switchport access vlan 3 set.

On the Adtrans the configuration has 3 VLANs
VLAN1 = default
VLAN2 = named vlan0002 but has no ip address assigned
VLAN3 = trainingroom which has a 192.168.50.1 address.

There are two loopback addresses also configured:
Loop1 10.10.10.254
Loop2 192.168.50.100

All other interfaces on the switch are configured for VLAN2 and VLAN3 traffic.

The problem I'm having is that the Trainingroom PCs, which will be used for Internet access only are working for a short period of time and then they stop. They could work for 15 minutes or an hour and then they stop working. If I turn off switchport access on the interface on the ASA and then set it again it will come back for a little while and then it goes again.

I'm not familiar with Adtrans. This is the first of their products that we've used. I know the Cisco ASA is configured correctly. DHCP is configured on the Adtrans and the PCs are getting their IP addresses from it. I'm lost as to what else could be wrong.
I would appreciate any help or guidance at all on this one. Here's hoping someone can help me!!
thanks

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