I lose my internet connection after 5+ minutes-must restart to get it back

In the past day or two when I use the internet with my MacBook Pro-13" running Snow Leopard 10.6.4 I suddenly realize after 5-25 minutes that I am no longer connected to the internet. (I have 2 Internet Service Providers in my home-office setup)
This occurs when I am using either of the ISP's: VOO or BELGACOM; and it occurs if I am using via ethernet cable (primarily VOO) or WiFi (primarily BELGACOM). But it fails with wireless VOO and wired Belgacom, too.
Suddenly I see that my WeatherDock 2 is not updating or I check the weather somewhere else or I'm going to a new page in Safari and it just has a white page for a long time and I know the internet is GONE. Sometimes the NETWORK Preference panel still tells me I'm connected (wired LAN type); although generally when it is via wireless it turns to the red dot and tells me I am not connected.
With Wireless if I try to reconnect, often it brings up the WPA password box - but it never connects.
Logging-out and loggin-in does NOT work; neither does sleep and waking from sleep.
But if I do a restart- automatically my preferred WiFi server is working great - but for how long? Generally 10-20 minutes then gone...
HELP - this is a relatively recent problem (last few days) - and a nightmare - can't get anything done!
GLAD I SAVED THIS BECAUSE I CANNOT SEND IT - AFTER JUST 5 MNUTES THE NETWORK CONNECTION IS GONE AND I HAD TO RESTART-- Hopefully this gets sent.
Best regards,
Steve Schulte
Saturday 9 October 2010

Thanks and I shall be trying these things - plus perhaps a new router (I have 2 now, and will try to just use the newest one - eventually might get an 8 port out as I have 2-3 computers plus 2 printers...)
Since I have 2 different ISP's (VOO and BELGACOM) I make sure to turn-off the one (unplug or if WiFi just turn-off WiFi). The eMac does NOT have WiFi.
The Belgacom modem has its own built-in WiFi - again the eMac cannot access that - other than via the PBG4 accessing that WiFi and the eMac connected to the PBG4 via FireWire 400 cable for internet access. That works and doesn't seem to cut-out.
I'll follow your other hints-- no "MINI" involved - just an eMac 2005 without WiFi and a PBG4 and my MacBook Pro-13" mid 2010 (and that seems to have a HD problem...)
I'm not sure how to "RELEASE AND RENEW" my IP address. Also not sure how to access the router LOGs.
DI-604 router is at least 6 years old---
Thanks for any reply - hope to get back to this later today -
regards,
Steve
Wednesday 13 October 2010

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