1. Not much you can do short of trying another router. Alternatively, most (all?) routers have a web interface for config and diagnostics; it'll tell you about your line status and whether (for example) your line tripped out. Particularly if your line's usual ADSL speed has only a small noise margin, your line might be susceptible to tripping off and/or retraining from time to time - but this should be a quick thing, outage of only a minute or two.
2. Umm. Radio interference? Depends on the distance between mac and airport, whether there's anything nearby emitting junk radio noise, other folk using the same wifi channel, cosmic rays, power surges...
3. Very unlikely. Rebooting B and it starting working again is arguably indistinguishable from the case where you did nothing for a couple of minutes and then tried again to see if A had spontaneously come back to life.
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Date: 2008-11-13 12:35 am (UTC)2. Umm. Radio interference? Depends on the distance between mac and airport, whether there's anything nearby emitting junk radio noise, other folk using the same wifi channel, cosmic rays, power surges...
3. Very unlikely. Rebooting B and it starting working again is arguably indistinguishable from the case where you did nothing for a couple of minutes and then tried again to see if A had spontaneously come back to life.