missing pieces in book

I was reading a book I downloaded and suddenly there were pieces missing.
When I open the book on my PC, the whole text is there.
I tried downloading it again but again pieces are missing.
It's always at the end of a chapter.
The sentence ends abrubtly, next page starts a new chapter.

I finished the book and went on PC to find the missing parts.
Now there is a second book in this series and I wonder if the same problem will occur.
It never happened before.
Anyone had this?