No IP address intermittently on Dell laptop when connecting to EA6400

Ever since I have a new EA6400 wireless router, my Dell Latitude laptop doesn't always get an IP address when connecting to the router. It's only a problem with the Dell, other devices connect without trouble. The Dell laptop doesn't have problems with any other routers it connects to. Any ideas...?
When connecting, the wireless icon in the tray sometimes shows a yellow exclamation mark saying 'No internet access'. The wifi status shows 'Limited' in that case. The solution is most of the times to turn off wifi completely, then turning it on again. This apparently forces a reconnection including a new IP address from the EA6400. My setup is pretty out of the box, no changes made to DHCP settings or other network related things. I'm puzzled...
Any suggestions greatly appreciated!

Internet Service Provider and Modem Configurations
What ISP Service do you have? Cable or DSL?
What ISP Modem Mfr. and model # do you have?
Wireless Configurations
Ensure the default (linksys) SSID name is changed. Ensure that different SSID names are used between each WiFi 2.4/5Ghz radios for dual band routers. Can be anything and not something that's already in use by any neighbouring WiFi routers.
What wireless modes are you using?
2.4Ghz and 5Ghz routers: Try single mode G or N or mixed G and N on 2.4Ghz and single mode N or Mixed on 5Ghz?
Channel Width set for Auto 20/40Mhz or try 20Mhz only.
Try setting a manual Channel to a open or unused channel. 1, 6 or 11. 11 for single mode N if the channel is clear. 13 for EU regions. Try channel 48 or 149 on 5Ghz. http://en.wikipedia.org/wiki/List_of_WLAN_channels
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=f2625b15a5d7454b8e7fafbe65d5aa63_4009.xml&pid=80&r...
What security mode are you using? Preferred security is WPA-Personal. WPA2 Only. http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=8ce9e83bd3784001aee72da7f1ef48e8_Changing_the_basi...
http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=19073
What wireless devices do you have connected?
Ensure any devices with WiFi adapter drivers are updated.
Any 2.4Ghz or 5Ghz cordless house phones or WiFi APs near by?
Any other WiFi routers in the area? Link> Use http://www.techspot.com/downloads/5936-inssider.html to find out. Use v3. How many?
WMM Support must be enabled for single wireless N mode to function.
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&articleid=5471
Router Placement
Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
3-6' feet minimum safe distance between devices.
Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=d9a3b1b2039741948a2365b053a93ea8_3759.xml&pid=80&r...
http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-esse...
http://kb.linksys.com/Linksys/GetArticle.aspx?docid=acca9b9008f04a66af818c2ab366001e_Positioning_the...

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