Threema - bad voice messages

Hi

i like to use threema with my XA 2 but the voice messages quality is really bad. Perhaps somebody knows - its like when you transcribe something in slowmotion. The Sound is really bad - in german you would say - “blechern” in english: “tinny”. I already reinstalled Threema.

Do you have an advice for me/ Can you help? I’m a Beginner.