In my case Microwave Oven was operating on one of the frequencies. I changed the channel and it helped. Eventually I got 5GHz router (since my Airport Express receives both 2.4/5GHz)and set it to 5GHz. Now it is perfect. 5GHz is not very popular, not used in cellular phones or microwaves, and has advantage of penetrating walls poorly. It is big advantage for me, at least, since everything is within one room while disturbing sources at 5GHz are behind the walls (if any).
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