Gemini TTS producing hissing sounds after 2-3 minutes of audio

Hello! So, I’ve been trying to implement the usage of Gemini TTS flash 2.5 preview to my app to read some text files as audio files, but there is a problem. After about 2-3 minutes, the audio quality goes quite bad, to the point of it being unusable; there are hissing sounds with the voice, which is bad. I tried chunking and then stitching the chunks, but the issue with that is that the voice changes between the chunks, and that is also not feasible. What options do I have here, or do I need to wait for Gemini TTS to get better?