BrailleSense U2 on iOS 14 Issues

Hi all
I updated my iPad Pro and iPhone XS Max to the latest iOS. Since then I am encountering some troubles as follows:
1. Sometimes my braille freezes for no reason. I lock then unlock the screen and it is back to normal again.
2. When I type using my braille, sometimes the character is repeated so many times. I am sure there is no problem with my braille input keys.
3. Sometimes when inputing text using the touch keyboard on the iPad screen, the content is either shown incorrectly or is not updated at all. I understand the issue of the latency to update the braille cells to reflect the content on the screen, however it is strange that it shows the wrong content. For example, I was proofreading a document, the word was ‘to’ and I wanted to add ‘in’ so the word should read ‘into’ instead of ‘in’. My braille showed ‘toto’ not ‘into’, although the screen shows ‘into’.
Please do let me know if there is any workaround for the problems I mentioned. I rely heavily on my braille device, as far as I remember these issues were not in iOS 13.
Thanks for any tips.