Wireless does not load balance and Connection drops to 1Mbps at a certain time

Hi,
We had wireless LAN setup and it seems that every afternoon, the connection notification on their laptop drops to 1Mbps and slowness on the network is experienced. how can I identify the cause of this drop connection speed?
Also when one of the APs went down, the other nearby APs does not cover for the AP that went down, is it not supposed to cover for the downed AP?
BTW out setup is LAP with 4400 series WLC with VoWLAN running on it but on differed radio and SSID. Data is on b/g while VoWLAN is on A.

also i am seeing a lot of coverage hole detection on the logs.
is there any problems with the coverage of the APs? should I place additional APs to cover up the holes?If you have available funds/resources then putting additional APs won't hurt ... especially if one of the APs fail.  Putting additional APs will also help distribute the clients.if it is cause by rouge AP how can i prevent it.
First, you have to know what radios is the AP using.  For example, if the Rogue AP is using 802.11b then disable your 802.11b or use a different channel.  I'm curious to know this is the case since the WLC would've used a different channel if a Rogue AP is broadcasting on similar channel (unless there's just too many Rogue APs using 802.11b).
you recommed any steps on how can i trace sudden  surge of wireless use I'd like to identify/isolate how correct is my hypothesis that it's due to the sudden surge of wireless use.  If this is the case, then I'd also like to know what application(s) are being used to overwhelm the wireless.

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