Is it the original iPad, iPad 2 or the new Ipad? If not the most current model which version of the iOS is installed ? Any recent changes (applications/hacks/iOS updates) ? Any recent damage/drops of the device ?
Too many unknowns for good advice.
The Home button on my iPad often does not respond quickly. Often must push it several times or hold it in for several seconds. Do I need to reboot? Or what?