Why not get a Cisco 675 or 678 instead? They'll do pretty much everything you need in a DSL modem, including firewall, NAT, etc. etc. And they'll be very stable. You can get them for about $100 or so on eBay.
I can't answer for the issue you have with sharing, but it sounds like a software issue. Or maybe you've got faulty network cards. Or it could be the cables. Or the switch too.
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