Another thing to look for is repeated scenes. Now this can be tricky to discover. The characters can have one scene in a restaurant and suddenly in a scene at the office, they're repeating the same words or mirrors of those words they said before. The reader can be bored or wonder if you think they didn't get the gist the first time. This can annoy them.
So along with the repeated words, now you have repeated sentence or paragraph openings and repeated information to beware of. Boring the readers won't have them returning for more.