Speak selection keeps stopping

I have a habit of listening to online novels while working. For this, I mainly use "Speak selection (Option-Esc)" function. However, from last few weeks, it randomly stops reading every few minutes.

For every chapter, I have to find the text where it stopped, re-select the remaining text, and use speak selection multiple times.

Has anyone else encountered this or has a solution for this?

Device description:

• MacBook Pro, M1 2020
• macOS Sonoma 14.5 (23F79)