The best way forward is to start with the simple stuff first. Try powering the iPad off completely - i.e. not just putting it to Sleep - by pressing and holding the Power button until the slider control appears. Accept the offer to switch off and then, when the iPad has completely powered down (blank screen), press and hold the Power button again until the white Apple logo appears and then wait for it to power back up. This simple procedure cures a whole load of problems and even Apple recommend you do this at least once a week.
Tim