IPad 2 Wi-fi connection problems

Question

I am lately encountering this problem with my internet wi-fi connection. It keeps dropping the signal. When I go to Settings to re-connect, it demands the password everytime. After entering the password, every single time there is the message: "Failure to connect" and on the second re-try it works. When I come home after work, the iPad does not automatically connects to the wi-fi. I have to connect it myself everyday then enter the password again and again.
After the connection, I can use my apps that require the internet (until the signal drops again) but there are no notifications from my apps. At the same time, I connected to the 3G internet and all my notifications appeared which were supposed to appear when I connected to the wi-fi. I have the iPad on recharge every night. The next morning when I check my notifications, most of them appeared at the same time (when the wi-fi was working fine). For example, I had a game update that such and such thing is ready 46 minutes ago when it should have been 3 hours before.
Someone suggested to try the "Forget this network" but there is no improvement.
To fix this, I have tried to restart the iPad. I have reset the network settings. Nothing helps
In short,
1) I have to enter password every time I connect
2) Signal keeps dropping
3) The notifications don't appear all the time from the internet apps. The real time notifications come intermittently or when I connect to 3G, they come instantly.

Answer 1

iOS 6 Wifi Problems/Fixes
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
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Look at iOS Troubleshooting Wi-Fi networks and connections  http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks  http://support.apple.com/kb/ts3304
iOS: Recommended settings for Wi-Fi routers and access points  http://support.apple.com/kb/HT4199
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues  http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
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If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom