There might be a different issue here, it is possible that the problem may be due to something other then the SBC DSL, have you tried formatting and a fresh install of OS? I know formatting is a last ditched effort for many people but i dont mind it. Also, is this SBC DSL also static? seems like theres another problem here, i would try not using the SBC software and configuring it for DSL manually via the Networking properties Applet, it is very unusual to see a system freeze due to broadband connection, also any error that reports when it freezes would greatly help in the diagnosis of this problem, but for now i would suggest try manually configuring the system with out the SBC software, if that is really the problem.
Good Luck
Confide