IMac wifi problems

My apologies for the duplicate, but would be great if someone could help me with this (was originally posted in Mountain Lion forum):
Hi,
Got an interesting problem here...my home network is powered by 2 Airport Extremes and I have a few Macs and numerous iDevices.  Connection is dsl and not the best in the world meaning I get short timeouts from time to time where I lose internet and it will come back after a minute or two.  My problem is with my iMac (all latest updates) if I lose internet it will not reconnect unless I off my wifi and then turn it back on.  I can hold my iPhone and confirm internet is back to working after a minute of losing it but even after an hour my iMac will not reconnect unless I do the off/on thing...
Also something interesting...this happened today while I was working on my computer and I received a popup saying I had lost connection to the hard drive plugged into my Airport Extreme (I did lose dsl for about a minute during this time).  So on my iMac it's like the internet and my network go hand in hand when they really shouldn't right?  Even without my dsl feed coming through for a minute or two it should not disrupt my home network right?  And note...during these times I do not lose signal to my Airport Extreme according to the radar icon on my iMac it's always steady black...
Hope I explained this right any help would be much appreciated,
rc

Did the problem start recently or been ongoing for a while?
How old is the iMac?
Did you just upgrade to 10.8.5?? I would do an SMC reset as there seems to be some people having wireless issues since then.
http://support.apple.com/kb/HT3964
Also something interesting...this happened today while I was working on my computer and I received a popup saying I had lost connection to the hard drive plugged into my Airport Extreme (I did lose dsl for about a minute during this time).  So on my iMac it's like the internet and my network go hand in hand when they really shouldn't right? 
It depends actually on how the setup is done.
If your AE is in bridge and the modem is the one doing router duties.. then it is possible the dsl drop out can have bad effect on the computer.. although it should pick up immediately after it.
Is it possible to swap over to ethernet and see if that has the same issue?
Look at Tesserax doco on wireless issues having to do with sleep and restart.. although yours is different I would still clean out all the old wireless settings and different networks and start over clean.
In fact I would factory reset the main AE that is router or bridge to the ADSL modem.. and start clean with wireless names.. all short, no spaces and pure alphanumeric. Short names can help a lot.
See the rest .. here.
https://discussions.apple.com/docs/DOC-3411
Try each step and see which is the solution.. if any.
I would also go back to 7.6.1 firmware as neither the latest two 7.6.3 or 7.6.4 help in any way IMHO.

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