I can not project from my ipad with digital av adapter, stop working. How can i do ?

First thing to try is to reset your device. Press and hold the Home and Sleep buttons simultaneously until the Apple logo appears. Let go of the buttons and let the device restart. See if that fixes your problem.

THANK YOU Ralph! I was afraid I was going to have to buy a new ipad! The connection stopped in the middle of a teaching day--worked in the morning, but not after lunch. I have re-started my ipad, but not the re-set you suggested. It WORKED! Going to copy that to my Reminders/Notes so I have it with me in case it happens again. Thank you!