(I've moved your post to a new topic. Please, next time open one bug per post and using bug category, this way is easier to track.)
Do you have something connected to input 1? When does it happen?
That's a known bug. You can track it here: https://github.com/moddevices/mod-duo-issues/issues/10
Accentuation is not supported, but of course you should have no problem trying to save it. We will fix it.
Not a bug. That's how it works today. Next update you'll see an info message when you try to access banks and UI is connected. Also reported here: https://github.com/moddevices/mod-duo-issues/issues/39