MBP can't find airport extreme but internet works

I have a MBP with Lion.  I just purchased an airport extreme and connected an external harddrive with time machine linked to it.  Perodically my MBP, loses the Airport Extreme base station and cant find the Airport Extreme.  It cant find it in Airport Utility even after rescanning.  When this occures, time machine wont work because it cant find the drive/server.  I can manually locate the airport extreme by using the IP address though and I have a working internet connection.  But it's getting annoying because it seems to be at random that the base station just disapears.

I bought an Airport Extreme yesterday and hooked it up today. Everything went great, but eventually all my wireless devices lost their connections. I've read several other forums where this has been observed as far back as 2009. Most attribute it to a firmware update, but that certainly isn't my case. My wireless devices include a Samsung TV, a Sony 'Google TV' internet box, and two Macs just to name a few of what I connected today. And they eventually lost their connection. Wired connections don't seem to be affected.
It appears that Airport Extreme's wireless feature is going into a sleep mode that is hard for it to wake up from, or it's overheating (it gets very hot). And this has nothing to do with signal strength, range, or interference. It could be a combination of settings as a 2010 post stated that Apple told him to do a hard reset and ensure "Allow Setup over WAN..." and "Allow SNMP" are both unchecked.  Neither are checked on mine, so I guessing that might have been a lucky workaround back then. It's a pain to restart AE and re-enter the password on any device just because AE might have been idle for a period. After more than 2 years of this behavior, I'm surprised it continues to this day with no fix or clear explanation. Maybe there's a solution out there somewhere.....

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