Why does my airport express 2.4 stop working

I have my network wireless using the Airport Extreme Base station and extended by an Airport Express.
The 5Ghz band tends to work fine, but not all my devices support it so I rely heavily on the 2.4ghz radio.
that radio tends to fail about every other day.  It just stops working. 
The airport express light stays green, but has zero throughput.
The 2.4 from the Airport Base station fails too.
The only way I can get it working again is to reset the base station.  Even then, it only works for a short period of time.
I checked to be sure nothing else was on the same frequency and have tried different frequencies/channels.  No luck.
Please help?

I agree with John, this sounds like very classic interference.
Luckily, there are things that can be done to get around it. For instance, keeping your Airport away from other sources of interference: cordless phone cradles are the really nefarious ones, but satellite receivers tend to cause really unfortunate issues in the 2.4GHz range as well. If you have either of those nearby, try to get the Airport and these devices as far away from each other as possible.
Also, if you have 5+ other wifi networks in your area, these can also be scrambling your 2.4 signal. Try using Airport Utility to change your radio channel:
Version 5.5.3: Applications> Utilities> Airport Utility> Click on Airport device > Manual Setup> Wireless. Where it says Radio Channel, experiment with channels 3 and 9. Click 'update' after changing the channel.
Version 6: Same channels, but path is Applications> Utilities> Airport Utility> Click on Airport device > Edit> Wireless> Wireless Options

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