Upgraded memory results in connectivity problems. Why?

4 year old mac mini. Recently upgraded memory from 1gig to 4gig. Since then, after a short time online, I get notified I am disconnected. Says isp has failed, even tho there is strong signal. I cantinue diagnostic steps. Notification pops up that says the configuration has changed. Then I am reconneced. Never stays reconnected for long. All physical components fine, checked out at apple store.
Any ideas on what the problem is?

Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
10.4 instructions...
Is that Interface dragged to the top of Network>Show:>Network Port Configurations.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
Click OK.

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Upgraded memory results in connectivity problems. Why?

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