Voice to Text stops listening half way through what I am saying

Hi all, the issue I am having is that voice to text stops listening half way through whatever it is I'm saying. the screen still shows it is listening, but words stop appearing and when I click done, a blue circle spins where i was typing until I delete it. I'm wondering if I need to restart my iPad or do something else to get thios feature to work normally again. Also, frequently when I use VTT twice in a row the second time I hit the microphone button, VTT won't respond and the space bar gets activated instead. This isn't a misclick; I'm definitely hitting the microphone. I normally have to restart whatever app I'm in to get this to stop. BTW, all of these issues are happening on my ipad air.