IPad suddenly rejects WiFi connection

Hi,
I have an iPad 3 which recently decided to refuse to connect to my home Wi-Fi. When I tap the connection name in Wi-Fi Settings, it connects to the network, but then immediately disconnects again, then reconnects, then disconnects and so on.
I took it to the Apple Store but it connected fine to their network and they ran a hardware diagnostic which said there were no logged Wifi hardware problems, so they said it was my router's fault and sent me packing.
When I got back from the Apple Store I plugged it into Xcode and looked at the console and router logs. It appears that the iPad does actually successfully connect to the router but then immediately tries to check both my e-mail accounts, and when these fail giving a "cannot connect to the internet" error it disconnects, tries again twice, then flags the connection as "problematic" and stops trying to connect to it. They appear to be failing because it is sending the request so quickly after joining the network that the firewall does not have time to set the iPad up; then by the time the set up is done the iPad has already deemed the connection failed and disconnected.
Is there any way to tell the iPad not to immediately jump on the Wi-fi connection in this way, or not to disconnect the whole network just because these initial attempts fail?

I haven't been able to try it on other network yet. I did try disabling the security on my home Wi-fi and it failed the same. But regarding your assertion above I don't think the "change-each-tyre-to-see-which-one-is-flat" strategy necessarily works here - the Xcode log shows that the connection break is being initiated by software on the iPad, not by the router, and the iPhone (which is an iPhone 5, no S, running the same iOS version) connecting fine to the same network suggests the problem is to do with some pecularity of how iOS behaves on the iPad 3 compared to the iPhone 5.
On a side note this is why I was disappointed with the Apple Store response (apparently they were baffled when I suggested using Xcode to view the console)

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