Problems With Public Server (Garrys Mod)

[kagorus]

Okay the Lan Hosting Works Fine But the internet one cuts out after about a minute, people can connect as stated but with the server cutting out, port forwards are set properly

BASIC INFO
Server OS: Vista Ultimate X64 SP2
Processor:Quad Core 3.2Ghz
Ram: In GB. 4GB
Game(s): Garry's Mod
Start Up Command: srcds.exe -console -game garrysmod -tickrate 100 -port 27015 -insecure +maxplayers 6 +map harbor2ocean_navalb1 +sv_gamemode sandbox +sv_defaultgamemode sandbox
Admin Mods: None

NETWORK AND BANDWIDTH INFO

Bandwidth: up 1Mb/s Down 8Mb/s
Router:
Product Name: ST780WL
Software Release: 6.2.27.2
Local IP of Server: 192.168.1.x
External IP: x.x.x.x (Rather Not Say)
Port Forwarding Screen Shot:

Typical Home Network: [Internet]--->[Router]---> [Computer]