Voice guidance stops in the middle of the guidance

Sometimes, the voice guidance stop in the middle of a guidance.
Kurviger mail said…it’s a preferences in the text to speech of my phone.
Ive got a Oneplus Nord.
Where can i find this text to speech.

Probably this was due to navigating with the display off? This is usually due to missing permissions, probably energy saving. I can't hear any voice output / turn instructions [Kurviger Knowledgebase]