How to run a cable internet on 877W router, please help.

Hello everyone!
I have made many variants of IOS configuration but nothing seem to work yet and finally I need someone to tell me if this is possible at all.
I was using 877W when I was registered to my ISP as a DSL user, everything was perfect. Now I'm using a cable internet and I just can't believe this device can't handle it. I'm trying to get it done for months with one result - network loop (I guess). Don't want to give up.
Situation is as following:
Because 877W doesn't have a routable port, I'm using a VLAN and a Bridge interface to assign an IP address from ISP.
ISP -> FE0 switchport -> VLAN 1 - BVI 1 (BVI with mac address set so ISP will give it IP from their DHCP)
interface FastEthernet0
interface Vlan1
no ip address
no ip redirects
ip virtual-reassembly
no autostate
bridge-group 1
interface BVI1
mac-address ####.####.####
ip address dhcp
ip nat outside
ip virtual-reassembly
By this configuration, internet works for for a while, then it drops and I have to restart BVI 1 interface to bring internet back again.
If I add this command in main config:
no spanning-tree vlan 1
Internet will never drop but it will became very slow, from say 35Mbps to 1-5mbps.
I think that I need somehow to force my ISP switch to "think" that my FE0 switchport is not a switchport but a single host.
Guys, I need your help!

http://download.oracle.com/otn_hosted_doc/forms/forms/A73071_01.pdf
Good luck...
Sim

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