Hello @guenter,
We haven't had any reports on that issue. But first of all I hope you are running on the latest version 1.09 of Cuety. I would also like to point out that even if the iPad dies from battery, the show will still go as it lives inside the LPU.
The issue seams to be related to your iPad. I would recommend that you check you charger, or if other application are draining you power.
Greetings,
Michael.