DirtBlonde ok thx for the info
As a fellow owner of the UI24R I have to sadly say that while this mixer is one of my favorites to use, it has a couple of bugs and one of them is a very problematic USB port and I had to go with another brand (QU-SB) and never had issues like that since.
I have tested this problem extensively and sadly have to report that nothing can be done, there are bad batches and better batches, no one knows which is which, I know the designer of this mixer personally and he is completely oblivious to this issue.
Sell the mixer get something else, trust me, you’ll have less gray hairs in the end. It’s not the iPad or the connector, it is the mixer. The usb input for plugging in a flash/hard drive is different and I had zero issues with that. Only the usb port to use the mixer as a sound card, tested with iPad, Mac, pc, you name it. All identical results to you dropout at a random time and only a reboot sorts this out.
I also have to say that I have tested and used other devices with exactly the same adapters/cables with NO problems. Helix, other mixers, three different sound cards, it is definitely the mixer.
If you want to keep the mixer you could get a sound card that has multiple outputs and connect those multitracks with cables to the mixer but that’s adding another device and cables and adding time to connect everything.