Hi!
We’ve been seeing the same behavior on our side as well. In our case, the issues became much more stable after disabling Gemini’s built-in VAD and switching to a manual VAD pipeline, and then making sure we explicitly mark start_activity and end_activity boundaries with correct timing. Without tight control of activity windows, we noticed the model would either stay silent or fail to resume properly after long user turns.
On a related note, I’ll leave here a post + repo where I documented the limitations we found around long live sessions, context growth, and how Gemini behaves when the session gets too long (including cases where responses stop arriving or the model interrupts itself). It might help others facing the same symptoms until the preview model becomes more stable.