having issue connecting to the DHCP serverYou mean long after they obtain an IP address from the DHCP, they can have trouble reconnecting to the DHCP? Or could it be trouble with DNS which goes through the same server? Still, the hard wired devices have no trouble.
I suppose it's like @craigbeck says, it will connect to the first one that responds.Yes and no. Yes, the client probably connected to that AP because it was the first one to respond to a probe, but if the client moves that AP may still be providing a signal which hasn't triggered the client's roam threshold action. If the client can still get a good signal from the first AP, even though there's one a lot closer, why should it move just for that reason? It's more disruptive to move between APs than it is to just stay connected to the one you're currently on.
which hasn't triggered the client's roam threshold actionLike:
Maybe connecting devices cannot distinguish the differences in signal strength between a near one (basement) and a far one (4th floor)
2. Are you just having this problem with MAC's?
3. If so what OS are they?
4. Any other wireless device having this issue?
5. What WiFi frequency you using?
6. What channel?
Just a few of the top of my head