Wifi trouble with new iMac

I recently got a new iMac (27") and I am having an ongoing problem with wifi connection. It should be noted that other Apple devices -- iPad, iPhone, MacPro laptop, and Apple TV -- do not seem to have any trouble. Nor did my old Mac Pro. But the iMac connection keeps dropping. I have researched this issue in the Apple Support Forum and followed much of the advice, e.g. establishing a new connection identity, adjusting the DNS. While these solutions seemed to work for a while it wasn't long before the problem returned. I have rebooted both the computer and the modem numerous times (it is a DSL connection, BTW). Those actions also seem to help for a while but sometimes they don't help at all.
Since I transferred data from my old Mac Pro I have wondered if I have a preference or permissions issue. I know how to delete preferences when software acts up and that has sometimes been very helpful. But I don't know how to accomplish a similiar fix with the wifi.
Software is up-to-date and I have not encountered any other problems with the iMac.
Thanks.
Alice

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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Apple - Find Out How - Mac Basics
How to "switch" from PC to Mac > Apple - Support - Switch 101
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