People Cannot connect to my gmod server after around 30 seconds

[Bryantdl7]

i have my server set up perfectly, no bugs, all ports successfully forwarded and all the fun stuff there...
but after around a minute everyone says my server isnt responding even when people are on it...
anyone know a simple fix?
someone else is having a similar issue but not exactly http://forums.srcds.com/viewtopic/19371