AP Extremes lose internet connection

I have three Extremes in different locations (different cities, not within one household) and all exhibit the same problem of losing the internet regularly. One unit is the latest dual-band model and this appears to lose the internet every 24 hours and requires power cycling in order to reconnect to the cable modem.
The other two are older single-band models and are each connected directly to ADSL modems by ethernet. These two lose the internet frequently, every few hours and, again, power cycling solves the problem. I initially suspected intermittent loss of internet from the cable/ADSL service providers but I have eliminated this possibility by doing tests by connecting a computer directly to the modem and proving that there are no outages. This problem has been plaguing me now for several months and I am at my wits' end.
The common denominator could be my settings because I have set up all three routers. But it is a very basic and straightforward setting and I can see no obvious cause.
This must be happening to other people and I would be glad of any guidance or suggestions of things to try.

All three of my APXs have dynamic IP, so I'm assuming the problem is nothing to do with the three different ISPs but more to do with the settings of the Extremes. If it were just a problem with one APX and one ISP I would investigate further, but it doesn't seem worthwhile in the circumstances.
(incidentally, my APX here in Greece has been up and running for three days now. In the previous seven days it required power cycling at least twice a day. I haven't changed any settings. Fingers are crossed.)

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