Screen share freezing on iPad

We have a set up for meetings with clients where we use one iPad as a camera and another to share a presentation. This essentially allows us to keep one mounted on a stand (to use as a camera and to see the clients) and one free for making notes and sharing the screen, thus avoiding the problem of the camera looking up your nose! The two ipads are connected to the same zoom account and this has worked well up to this point. Now however, we are having issues where the screen share is no longer working and is essentially showing a screen shot rather than what is happening on the screen. any ideas would be greatly appreciated.