Often no connection to my mac mini

the connection between my mac mini and my apple tv  2 is no ok. often ther is an interrupted connection. between iphone 4 and ipad the connection is ok.
why??
thank you for your help
cnwug

Welcome to the Apple Community.
Intermittent problems are often a result of interference. Interference can be caused by other networks in the neighbourhood or from household electrical items.
You can download and install iStumbler (NetStumbler for windows users) to help you see which channels are used by neighbouring networks so that you can avoid them, but iStumbler will not see household items.
Refer to your router manual for instructions on changing your wifi channel or adjusting your multicast rate.
There are other types of problems that can affect networks, but this is by far the most common, hence worth mentioning first.

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