When you say they lose connection, I'm presuming you mean you can get online for a few minutes and then you completely lose the network connection.
If so, I guess the first place I'd look is for any sort of interference in your environment, like a 2.4GHz cordless phone for instance. You might also try setting the router to work on a different channel, like Ch 11. I'm not at all familiar with this latest 2wire and any issues it may have so perhaps the members of the 2wire forum might also have some suggestions.
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2Wire