I have been a longtime user of Logos (since version 1.1, I believe). I have used the read-aloud feature in recent years with little and no troubles (I have third party voices).
However with L9, I also switched my "speaker" set up since I am using L9 in class a lot, and haven't done that before. What I am saying is that this may have done this before, but I didn't notice it. Previously, I used wired speakers, I now have a Bluetooth Plantronics so that I can hear/speak in my zoom classes too.
When reading through the page of text, and it comes towards the bottom, it pauses, pages, and continues at the top of the screen. when it starts, there is a little flash circle at the place where it begins again. This process is barely noticeable with wired speakers, and only a slight delay. I really only notice it if it does it mid-sentence.
However, using the BT wireless headset, it is "too noticeable." as part of the sequence, the audio is apparently disconnected and re-established when it starts at the top of the page. and the headset makes a beep sound when it connects to audio. by the time the beeps finish (a second or so), the voice is already past a word or two before it continues.
so now, when it does this, there is that annoying beep st start each page, and I miss the next word or two.