iPad reconnection issues

I use an iPad connected via a lightning cable to deliver Powerpoint slides to mimoLive. In general it works without any issues, but if the layer with the iPad screen is disabled and other layers used, I often need to re-connected the lightning cable to get the iPad layer working again after enabling the layer. Looks likes some strange connection issue. If I let the layer active, but in background, I don’t have this behaviour.

Anybody else with this issues? Or should I change from lightning connection to an hdmi connection and use a standard hdmi recorder for mimoLive?

Best regards,