Internet connection times out?

Charlie5

I have DSL from ATT. I must of changed something by mistake and now after a
few hours of use, after a reboot, the systray will get a icon that is for
connection disconnected. It appears in "Network Connections, LAN or high
speed internet. Local area connection 8 disconnected. Firewalled Realtek
RTL839 Family PCI Fast Ethernet ". I do not have a network and assume that
this still needs to be in Network Connections? That is the item that gets
disconnected and of course I can do nothing but reboot and start the process
all over again. Seems like it is on a timer or I do something that activates
the disconnect? Can someone advise what I should check and correct?

Thanks.
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Charlie5