Under heavy load internet gets killed, only a reboot can bring it back up

[Aniruddha]

Each time  my internet connection is under heavy lead it gets killed
after a minute of 10. I tried the following commands to get the internet
back up, but nothing helped:

/etc/rc.d/netif restart
ifconfig mynic down
ifconfig mynic up

Even worse the last time I issued a '/etc/rc.d/netif restart' my whole
system hardlocked (wasn't responding to capslock presses). So far the
only solution has been te reboot the computer. Is there any way I can
prevent my internet connection from getting killed? How do I get it back
up after it has been killed? Thanks in advance!




-- 
Regards,

Aniruddha