HTC Evo Keyboard Problem ?

So I upgraded to the Evo in November and I love this phone but when I began to customize it and figure out what I liked and worked for me I found the top app list for Android etc and the number one app was the advance task killer. It works ok every since then my phone keyboard randomly stops working and I have to press letters for a long time until it finally responds. They keyboard shows up but it doesn't type feedback. I took it to Sprint and they installed "new" firmware and said it should be fine. The next day I installed the task killer and again keyboard acted up. I took it back to sprint and explained this all to them and all they said was I had to order a replacement and pay for it!!!! Not even 90days with the phone and they want me to buy a new one. I uninstalled the app, reset the whole phone and today it did it again. Has anyone experienced this or know how to fix? Any advice or tips would be great. Thanks for reading
 
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