Not trying to pile on . Most ( if not all) of the recording I do with Cubasis is strictly audio and is only the iPad internal mic. I’ve had no issues using it this way. I’m awaiting an interface and I agree by troubleshooting the problem with eliminating some add ons, you may discover something causing these crashes.
Looking back since my original installation, Cubasis has never crashed, hung or glitched but again it is only the iPad. It is a 4th generation 64 gb.