Beamer drops in brightness when in zwift


My beamer is connected to zwift via ipad pro. When i launch the zwift app after a few seconds the brightness drops. When i touch the screen it gets back to full brightness. After a few second brightness drops again. This happens only in the zwift app. When iam in other apps or on the desktop of the ipad brightness is always at full.

The brightness of my beamer drops down when connected to ipad an my finger isnt on the screen. This issue is only when iam in zwift.