You will randomly lose you weapons in the gungame and be left with nothing. Not sure of the cause or what triggers it.
Also, take off stonewalled because people can get into the walls there or find a fix for it. And, aim_ak-colt_dust2007 is another bad map because it is flat and open. Flat, big, open maps aren't good for gun game because when someone gets to knife and nade level it is too hard to knife someone when there is no way to sneak by to get close to the players and it takes for ever.