Wifi issues due to IOS update 4.2.1

Recently I updated my ipod 3rd generation to IOS 4.2.1 and have encountered some wifi problems. Here's a disription of the problems my ipod is experiencing.
-when I connect to the internet it only stays connected for 2-3 minutes.
-my ipod no longer connects to the internet automatically and must be reconnected by turning the wifi off then turning it on again.
-connection is established to networks very slowly as well(regardless of the fact that I've been trying to connect 3 feet away from my router)
I'm sure the problem is the 4.2.1 update. I've turned my ipod on and off, reset network settings, and checked my router. Plus the problem didn't start until I installed the update to the ipod.
So does anyone here know how I can revert my ipod back to IOS 4.1 or something and I mean ANYTHING that will get my wifi working again. I would wait for a 4.3 update but I'll be out and about this christmas season and I would like to be able to have reliable wifi.
Message was edited by: robo1340

I have an Ipod touch 32 GB, it is a little over 1 year old. I've never had a problem with my Ipod's WiFi until I updated to 4.2.1. Now It will still connect but the distance from my router is GREATLY reduced. Even if I'm 1 foot away from the router my Ipod doesn't show full signal strength. Also when it is connected it drops a lot. Especially if I launch and APP. All the other wireless devices on my network all work fine and show the same signal strength they always have so I know it is not my setup. The problem lies with my Ipod and it started after the 4.2.1 Update. I've tried resetting the whole device. I've tried resetting the wireless settings. the Ipod still thinks it has a weak signal and drops a lot. Is there anything else to do, or anyway I can roll back the Ipod's OS 1 version to when it worked just fine?

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