I recently needed to replace my Billion 7800n, so got the Billion 7800DXL.
Until recently, I've never had reason to use the Wi-Fi, but have a notebook computer too now.
With the 7800n, my notebook and two visiting family members iPhones were 'seen' and connected as soon as they arrived or the notebook was switched on.
With the iPhones, there's been a problem connecting each time they've visited, and eventually they manage it if re-doing the password process etc.
Today, I used the notebook for the first time since getting the new router, and it kept losing the connection: sometimes very briefly, other times for a longer period.
I was sitting at a table right through the wall of where my router is ..perhaps 4 feet away.
Son found his iPhone losing connection too while he was here.
He re-did the password etc on both devices and they seemed fine, but a couple of hours later, long after he'd left, the notebook was continually losing the connection.
This router only has 2 ariels whereas the 7800n had thee, but not sure that would make any difference.
If I get time tomorrow, I'll try using the notebook in this same room as the router and see if it remains connected.
Just wondered if there was likely to be any simple reason for the poor performance in just the next room.