Airport Extreme (brand new) dropping wifi signal every few minutes

i have brand new airport extreme, , every few minutes drops wireless signal , way correct reset router. gives?

has date firmware (did 1 out of box). multiple devices connected it, either via wireless or directly plugged in via ethernet. 1 mac (ethernet), 1 iphone, ipad, appletv, windows phone, windows desktop (wireless).

every time connection goes, every wirelesss device can no longer see network , not reappear until airport has been reset.

i've tried restoring factory settings , starting scratch, did nothing problem.

thoughts or ideas? or did bad 1 out of box?

software (and mean all) latest on every device. os x 10.7.3, ios 5.0.1, updates applied windows 7 , windows phone 7.

 

have tried selecting different channel? airport radar widget can show channels being used nearby networks, avoid conflicts/interference.

 

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