I don't know if that helps anybody, but OK, my two cents, I've been on Rollanet two years now. I don't get disconnected, ever. MSitis or something, but I don't want to be flamed and charbroiled. Besides I know some Macs that have the same problem. I think I have an unusually good phone line.
Line noise seems to be the problem.
It might be a combination of line noise and something at Rollanet. We have all heard that a million monkeys banging away on a million typewriters will eventually reproduce the entire works of Shakespeare. Now,thanks to the Internet, we know this is not true.