AE not recognized by Airport Utility after a steady use of several months

I have been using Airport Express (now version 6.3) with my iMac since 2007, actually I have no hassle when I set them up in the first place. But the strange thing is after a long steady connection, the internet could suddenly disappear and at the same time I cannot use Airport Utility to 'see' my AE station. It is not found when I launched Airport Utility. This happens periodically and continuously for 3 years. I usually will power off all devices including the modem, AE and the Mac for few minutes and restart them in the same sequence. It doesn't work immediately and I have to struggle with it for a while. Depends on how lucky I'm, probably after 1 hour or sometimes few days, everything will be back to normal. but I'm sure I didn't do anything special, I just repeatedly tried diagnosis tool and switching on / off things...
It is quite annoying, has anyone experienced the same? I welcome any hints to solve this. thank you.

Rayllam01 wrote:
I welcome any hints to solve this. thank you.
nei hau ma and welcome to Apple discussions !
airport utility will see the AX when you connect it and your Mac by ethernet cable.
have you checked for wireless interference from other networks in your vicinity ? i have lived in HKG and know how crowded it is.
download iStumbler (won't work on Snow Leopard) or AirRadar and check on which channels other networks in your area broadcast on. change your channel(s) as far away as possible from them.
alternatively, consider getting powerline adaptors such as these and to go all wired.
good luck !

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