"Read Aloud" function on response starts from beginning after reading > 600 words (chatgpt4o on iphone)

“Read Aloud” function on response starts from beginning after reading > 600 words (chatgpt4o on iphone)

I’m really loving passing in couple pages of an epub and having GPT read it aloud while I read along with my book. Unfortunately, after about 2 pages, the reading randomly resets and starts from the beginning.

I don’t experience this bug when doing the same in browser.