We have an Apple Timecapsule here and our iPads never loose connectivity when on that WiFi router. BUT if we use any 2 of our other WiFi routers, we loose connectivity a lot. We shut down all WiFi in the office, put one iPad on LTE and made it a hotspot, connected another iPad to it tethered and guess what? The iPad on WiFi looses connectivity and the LTE iPad stays up no problem. When I say looses connectivity I mean the WiFi icon goes away altogether. As soon as we exit whatever app we were in and go back to the iOS main interface, wait 5 seconds then the WiFi icon re-appears and all is good. If that does not work (which happens sometimes), we go into settings, WiFi, flick it on/off and voila, it works again.
I also did what a few others suggested and that is get an older WEP based router. That works like a charm.
Other interesting tidbit about iPads/Time capsule. We have a 100Mb pipe for the internet. Both uplink and downlink. If I plug a computer directly into the TimeCapsule using Gigabit ethernet, I get 72Mb down and 65Mb up. But using an iPad 3 or 2 on WiFi, I get 5-8Mb up and down (with no other devices on the Timecapsule). Now if I take the iPad 3 and put it on LTE, disable WiFi and do a speed test, I get 25Mb down and 19Mb up.
Last interesting fact. At home I have an older Linksys router (I think wrtg54) and for the love of me, I cannot get ANY Apple product to connect to it UNLESS I enter the key using hex digits. Anything else and it fails. Same problem with my Macbook Air and Macbook Pro. My Windows 7 machine can just use the passphrase.
[Edit 1] All iPads are running the latest version of iOS as of today (5.1.1)
Message was edited by: ejkitchen