If you haven't tried this - do it. Some people use the word reboot to mean restart so i just want to make sure that you tried a reset/reboot.
Reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.
See if you have many apps in the task bar. It really shouldn't matter - or so we have been told - but I have a system status app on my iPad - and I can watch the memory being freed up in this app when I quit/close apps in the task bar.
Go to the home screen first by tapping the home button. Quit/close open apps by double tapping the home button and the task bar will appear with all of you recent/open apps displayed at the bottom. Tap and hold down on any app icon until it begins to wiggle. Tap the minus ➖ sign in the upper left corner to close the apps. Restart the iPad. Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.
See if that helps at all.