Apple posts article on iPad/Wi-Fi issues
Having problems getting an iPad to join or rejoin an Wi-Fi network? Apple has posted a KnowledgeBase article (http://support.apple.com/kb/TS3304) on the matter.
Apple says that, under certain conditions, iPad may not automatically rejoin a known Wi-Fi network after restart or waking from sleep. This can occur with some third-party Wi-Fi routers that are dual-band capable when using the same network name for each network or using different security settings for each network. If you encounter this issue, try the following:
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