TC firmware 7.3.2 versus 7.4.1!  What's recommended for best connectivity?

for some time now my internet connections drops for no apparent reason and then comes back on. These interruptions last anywhere from 3 sec to several minutes.
I read somewhere that downgrading to Airport Utility firmware 7.3.2 helps.
Other suggestions were:
- deleting airport and internet related .plist files from the preferences folder.
- delete a apple.airport.kext file from the Extensions folder.
- switch channels in my 802.11 n (b/g) network.
Nothing of the above changed for the better.
here is what I gathered so far and tried myself based on numerous posts with people having similar problems:
Airport Utility> Wireless options:
- WPA Group Key timeout is set to 365 days,
- I use "Interface Robustness) (both under "wireless options") .
Under System preferences>Network settings:
- IPv6 is turned off,
- Airport is set on top of "service order.
- I deleted all other networks except for the one I am using.
Here is my basic set up:
I am on 10.5.6 and use a 1TB 1. generation TC. Backups run normally but the wifi connection (just 5 feet of direct though 2 windows). I am connected wirelessly though a PPPoE connection
Log in/ Start up items (under System Preferences>Accounts:)
I don't have a Realplayer in my start up items (as suggested as a potential problem in one of the forums)
can a change back to the older firmware help? or should I forget about the TC and reactivate my old and trusted 1. generation Airport Basestation?
thanks in advance for any advice

Thx Bob,
I tried the downgrading to 7.3.2 and it did not help matters.
I am not sure when or what exactly happened to make the TC act up.
I might go back to the old Airport Basestation if I don't find a solution here in this forum.
I talked to several Apple Care guys and had ISP folks check my modem.
any other suggestions?
thx

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