Dictation fails and deletes all text already dictated
I have this utterly annoying behaviour on macOS dictation. I start to dictate and after a while dictation stops and deletes all text already written. I googled all around for this and I need to know if anyone else is experiencing this problem and ideally how to solve it. I've already tried all fixes to problems with dictation without any result.
You can see the behaviour in the very end of this screen recording.
Thanks for your help!
MacBook Pro 15″, macOS 10.13