Renew your lease. The iPad is a known issue with DHCP leases. Long story short, try to keep an internet address into a network without DHCP renew its DHCP lease. The network believes that the Internet is fair game, and problems to someone else. When working in a DHCP network
* Click Settings / General. In Auto-Lock, select "Never."
* If you are losing the connection DHCP at work, tap the blue arrow next to the name of the network and "renew the contract."
* When you finish working on the network, not lock the screen without either shutting down or turning off the WiFi first. To turn off the WiFi, go to Settings / WiFi, and set the switch to "Off". Increase the brightness. Lots of energy saving tips we recommend that you lower the screen brightness to save power, but if you are losing connectivity, is a compromise. No one is safe, but it is speculated that the figures iPad to reject its brightness is an attempt to save battery life and decides to reject your WiFi radio too.
Some complaints are focused on self-gloss, a built-in feature that turns the brightness up and down based on environmental conditions. In turn the brightness up to maximum, and could receive a boost WiFi signal suddenly too.
WEP and QoS.
* WEP is an encryption protocol. Your iPhone is more comfortable with WPA2, if that protocol is available on the wireless modem is connected to - so dump the WEP settings.
* QoS select from a wide range of bands to connect to the Internet automatically - unless, of course, you're in an Apple product like the iPad. Apple does not support QoS, to disable it.