Actually I've no issue to connect to my access point - this works like a charm, but it does not stay connected.

Nevertheless, I just changed the channel - no reason to not give a try. I was running channel 5 while InSSIDer tells me a bunch of neighbours are using channel 4 (how do they survive ?), so I moved to channel 9 which is unused, as well as 7, 8 and 10, so the frequency is less crowded.

Let see if this goes better tonight