Mac Mini drops internet connection (ethernet)

Hi
I have a brand new mac mini w/ mac Os 10.5.2. I connect to the internet via ethernet: it works fine for some time (30 mins, 2 hours) then, apparently for no special reason, it drops the connection and I need to reboot to restore it. It is connected to a switch hub with other devices (macBook, AppleTv) that continue to work fine, so it is not an ISP issue. After rebooting the problem occurs with higher frequency, i.e. connection lasts for shorter and shorter periods then reboot is needed every other 5 mins.
I have no clue whether it is a hardware or software problem -- please help.
Thank you

Hi Keith
Thank you for your message - I figure it should be something like what you are saying. I am still kind of puzzled to why it connects OK with iBook, even when it is connected alone and/or together with AppleTV and/or macMini.
I have another macMini (PowerPC) at the office connected to same hub type (same ISP, same hardware) and I never experienced a problem like that although we are using it with other iMac's on the same network.
I will give it a try and get a router to see if your suggestion is right.
Thank you again,
macko d.

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.
Dear Bluenova - ( +or other interested readers+ )
I know that this reply is two months since this topic was initially posted.
This is a longstanding Airport Extreme ( AEBS ) problem that's been noted since 2006-2007.
It has been an ongoing issue for me -AND- I continue to experience it even after recently upgrading my AEBS.
I finally called AppleCare in mid-Sept. and opened a formal problem case report.
As of today (Oct 15, 2010) I still have an open & unresolved case with AppleCare.
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I was curious what steps or actions you have taken -and/or- if you still experience the problem.
_Readers Please Note_
Many users have posted messages regarding problems with Airport Extreme *+DROPPING CONNECTIONS+* .
However, with careful reading, it becomes obvious that many forum posters are not sufficiently clear
-and- often confuse or do NOT make the distinction between ..... DIFFERENT TYPES OF CONNECTION PROBLEMS.
. ( wifi/network connection probs - vs - internet connection probs )
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http://discussions.apple.com/thread.jspa?threadID=2227197
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