ISP disconnect bs during tourny...hellllllllllllllllllllllllllllllp!!!

[DoubleDealDecker]

How can one come up with a computer setup that will minimize the threat of disconnects while playing online?
My ISP is CableOne and their system is all new fiber optic. My computer is a Dell P4 and modem is a Motorola just like CableOne rents to its' victims.
When I call support, they just have me unplug the cables on the modem and plug them back in. They are now having their engineering department look into my problems, but this is all probably bs.
I am currently trying to make the transition from limit to no limit, so disconnects are no longer as amusing as they used to be.
What combination of modems, computers, ISPs, fairy dust or whatever can best protect me from disconnects. Also, is there anyway to tell, like pings or whatever, if the problems are with the cable company or with my computer stuff? Thanks in advance.