Not sure about the wifi problem as i've never experienced it on my n810.

But here is the quick version of the archos wifi problem I experience.

I'm online on my home router, everything works fine then all of sudden my connection drops. I go to settings, try to turn off wifi then I get an error message saying that wifi can not be turned off. I can't connect to wifi nor can I turn off wifi. Only resoulution is to restart the device.

That and the touchscreen that isn't as good as the n810 are my two biggest gripes with the archos.

Besides that it's a lovely device.