Linksys Wireless Router :: E4200 Dropping Apple IPad 2 At Random Times

Had an E4200 for a couple of months now and have not been able to resolve an issue with the router dropping an Apple iPad 2 at random times.The E4200 is replacing a Cisco Aironet 1200, which never dropped any clients, iPad 2 or others, and never displayed any of the issues below.
 
TECH DETAILS:The E4200 is being used purely as an access point.  All extras are not in use and are disabled.

Firmware 1.0.03
Hardware version 1.
 
BASIC ISSUE:The E4200 drops an Apple iPad 2 off the 2.4 Ghz Mixed (B, G, N) network.  The user must then select the network to rejoin.  Rejoining occurs without incident.  The same issue occurs when the network is restricted to B, G.  The drops occur at what appears to be random intervals - sometimes 10 minutes apart, sometimes hours apart.  We can have as many as 6 drops in an hour.  A ping to the apple ipad shows the device stops responding to pings about 10 seconds before the user is prompted to rejoin a network.  Meanwhile, a ping to the E4200 itself from a laptop connected via the E4200 on the same radio as the ipad continues to work without fail during this incident.

1. The iPad 2's cannot connect to the 5Ghz radio.  I believe iPad 2's are supposed to support 5Ghz.

2. Both our Apple TVs do not connect to the 5Ghz radio: they fail with a "There was an error connecting to the network. Check your settings and try again. (-3914)" error.  Apple TV supports 5Ghz.

3. The admin interface for the E4200 is very slow sometimes.  Probably over 20 seconds to render some pages when it gets really bad.  As a comparison, Internet-based pages on fast sites that delivered via the E4200 itself load in less than 2 seconds.

4. The HTTPS version of the admin interface can only be connected to via Safari browers.  Both Internet Explorer 9 and Chrome 16 fail to connect with a "Connection reset" error.  In Chome, it says "Error 101 (net::ERR_CONNECTION_RESET): The connection was reset."  This is across multiple devices.  There is no issue with straight HTTP.
 
All other devices - including Macs and PCs - connect fine with the E4200 on both 5Ghz and 2.4 Ghz radios, even if they cannot access its admin interface via HTTPS.I've presented quite a few issues above, but the main one is the drop outs for the iPad 2 devices.  I'd present logs on drops, but the thing doesn't record any useful logs.
 
Basic wireless config:

5Ghz:
Network Mode: Wireless-N Only
Channel width: Auto (20 or 40 Mhz)
Channel: Auto (DFS)
SSID Broadcast: Enabled

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