Every single MMO group ever: "BRB resetting my modem/router to fix this lag"
In other words, "I will go linkdead for 10 minutes and when I get back I'll complain about the same lag"
It doesn't help that often they are talking about resetting their modem to fix their FRAMERATE.
Not once in the history of the internet (for me, windows for workgroups 3.11) has it ever been helpful to reset a modem to "clear up lag." Or more accurately: Not once have I ever had a problem with latency that was solvable on my end, other than maxed out bandwidth and needing to throttle/close other programs. If you have a connection at all, resetting your modem does fucking nothing. My current modem hasn't been powered off in years. (at least not intentionally)
The only scenario I can imagine this helping is if they have mountains of shit being downloaded at once (possibly by roommates or their raging virus infestation) and a reset causes those connections to take time to ramp up again.