I was getting the same message to. I thought maybe it was from the hot spot I was using because Comcast was sucking seriously awful. But it got so bad I had to leave the ground assault stf I was doing and it was pissing me off. So my apologies to the teammates I left in a lurch.
I am connected to my Wireless router using a Cat 5 cable.
I went into the Wireless G's setup.
And switched my Wireless configuration.It's still set as wireless Mixed.
But all i did was switch the Channel on the router i have not seen a single Lag or a Bad Server Respond yet so i kinda think this cures the problem.
And i think that most people that have a Wireless router with cat 5 on the back if there getting bad Server Responds from games.
Log into the Wireless settings and then go to your wireless Settings Then in Basic Wireless setting look for Wireless Channel: There should be a normal setting some are set to 6 try a different setting some go from 1 to 11.I think the higher setting will work best.Then Save the Settings.